31398776809 has 9 divisors (see below), whose sum is σ = 31815445053. Its totient is φ = 30987502572.

The previous prime is 31398776791. The next prime is 31398776837. The reversal of 31398776809 is 90867789313.

The square root of 31398776809 is 177197.

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

It is not a de Polignac number, because 31398776809 - 2¹⁹ = 31398252521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31395776809) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13997442 + ... + 13999684.

Almost surely, 2^31398776809 is an apocalyptic number.

31398776809 is the 177197-th square number.

31398776809 is the 88599-th centered octagonal number.

It is an amenable number.

31398776809 is a deficient number, since it is larger than the sum of its proper divisors (416668244).

31398776809 is an frugal number, since it uses more digits than its factorization.

31398776809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4644 (or 2322 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 61.

The spelling of 31398776809 in words is "thirty-one billion, three hundred ninety-eight million, seven hundred seventy-six thousand, eight hundred nine".