31522732473 has 4 divisors (see below), whose sum is σ = 42030309968. Its totient is φ = 21015154980.

The previous prime is 31522732463. The next prime is 31522732489. The reversal of 31522732473 is 37423722513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37423722513 = 3 ⋅12474574171.

It is not a de Polignac number, because 31522732473 - 2⁴ = 31522732457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31522732463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5253788743 + ... + 5253788748.

It is an arithmetic number, because the mean of its divisors is an integer number (10507577492).

Almost surely, 2^31522732473 is an apocalyptic number.

It is an amenable number.

31522732473 is a deficient number, since it is larger than the sum of its proper divisors (10507577495).

31522732473 is a wasteful number, since it uses less digits than its factorization.

31522732473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10507577494.

The product of its digits is 211680, while the sum is 39.

The spelling of 31522732473 in words is "thirty-one billion, five hundred twenty-two million, seven hundred thirty-two thousand, four hundred seventy-three".