31193639213 has 8 divisors (see below), whose sum is σ = 34366350816. Its totient is φ = 28077082000.

The previous prime is 31193639203. The next prime is 31193639231. The reversal of 31193639213 is 31293639113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31193639213 - 2¹² = 31193635117 is a prime.

It is a super-2 number, since 2×31193639213² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31193639203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14037431 + ... + 14039652.

It is an arithmetic number, because the mean of its divisors is an integer number (4295793852).

Almost surely, 2^31193639213 is an apocalyptic number.

It is an amenable number.

31193639213 is a deficient number, since it is larger than the sum of its proper divisors (3172711603).

31193639213 is a wasteful number, since it uses less digits than its factorization.

31193639213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28077195.

The product of its digits is 78732, while the sum is 41.

The spelling of 31193639213 in words is "thirty-one billion, one hundred ninety-three million, six hundred thirty-nine thousand, two hundred thirteen".