31497020677 has 4 divisors (see below), whose sum is σ = 32091304140. Its totient is φ = 30902737216.

The previous prime is 31497020603. The next prime is 31497020741. The reversal of 31497020677 is 77602079413.

It is a Cunningham number, because it is equal to 177474²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77602079413 = 37537 ⋅2067349.

It can be written as a sum of positive squares in 2 ways, for example, as 22706270596 + 8790750081 = 150686^2 + 93759^2 .

It is a cyclic number.

It is not a de Polignac number, because 31497020677 - 2⁷ = 31497020549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31497026677) 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, 297141652 + ... + 297141757.

It is an arithmetic number, because the mean of its divisors is an integer number (8022826035).

Almost surely, 2^31497020677 is an apocalyptic number.

It is an amenable number.

31497020677 is a deficient number, since it is larger than the sum of its proper divisors (594283463).

31497020677 is an equidigital number, since it uses as much as digits as its factorization.

31497020677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594283462.

The product of its (nonzero) digits is 444528, while the sum is 46.

The spelling of 31497020677 in words is "thirty-one billion, four hundred ninety-seven million, twenty thousand, six hundred seventy-seven".