31577672213 has 4 divisors (see below), whose sum is σ = 31588368588. Its totient is φ = 31566975840.

The previous prime is 31577672183. The next prime is 31577672239. The reversal of 31577672213 is 31227677513.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19437378724 + 12140293489 = 139418^2 + 110183^2 .

It is a cyclic number.

It is not a de Polignac number, because 31577672213 - 2⁶ = 31577672149 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 (31577672713) 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, 5343758 + ... + 5349663.

It is an arithmetic number, because the mean of its divisors is an integer number (7897092147).

Almost surely, 2^31577672213 is an apocalyptic number.

It is an amenable number.

31577672213 is a deficient number, since it is larger than the sum of its proper divisors (10696375).

31577672213 is a wasteful number, since it uses less digits than its factorization.

31577672213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10696374.

The product of its digits is 370440, while the sum is 44.

The spelling of 31577672213 in words is "thirty-one billion, five hundred seventy-seven million, six hundred seventy-two thousand, two hundred thirteen".