31046749385521 has 3 divisors (see below), whose sum is σ = 31046754957483. Its totient is φ = 31046743813560.

The previous prime is 31046749385507. The next prime is 31046749385537. The reversal of 31046749385521 is 12558394764013.

The square root of 31046749385521 is 5571961.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 25080454625521 + 5966294760000 = 5008039^2 + 2442600^2 .

It is not a de Polignac number, because 31046749385521 - 2³³ = 31038159450929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31046749385581) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2785981 + ... + 8357941.

It is an arithmetic number, because the mean of its divisors is an integer number (10348918319161).

It is a 1-persistent number, because it is pandigital, but 2⋅31046749385521 = 62093498771042 is not.

Almost surely, 2^{31046749385521} is an apocalyptic number.

31046749385521 is the 5571961-st square number.

31046749385521 is the 2785981-st centered octagonal number.

It is an amenable number.

31046749385521 is a deficient number, since it is larger than the sum of its proper divisors (5571962).

31046749385521 is an frugal number, since it uses more digits than its factorization.

31046749385521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11143922 (or 5571961 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 58.

The spelling of 31046749385521 in words is "thirty-one trillion, forty-six billion, seven hundred forty-nine million, three hundred eighty-five thousand, five hundred twenty-one".