31316643391 has 8 divisors (see below), whose sum is σ = 35961696000. Its totient is φ = 26971271640.

The previous prime is 31316643389. The next prime is 31316643403. The reversal of 31316643391 is 19334661313.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31316643391 - 2¹ = 31316643389 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 (31316643191) 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, 74919991 + ... + 74920408.

It is an arithmetic number, because the mean of its divisors is an integer number (4495212000).

Almost surely, 2^31316643391 is an apocalyptic number.

31316643391 is a deficient number, since it is larger than the sum of its proper divisors (4645052609).

31316643391 is a wasteful number, since it uses less digits than its factorization.

31316643391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149840429.

The product of its digits is 104976, while the sum is 40.

The spelling of 31316643391 in words is "thirty-one billion, three hundred sixteen million, six hundred forty-three thousand, three hundred ninety-one".