31391053991 has 8 divisors (see below), whose sum is σ = 34727107968. Its totient is φ = 28135387000.

The previous prime is 31391053957. The next prime is 31391054011. The reversal of 31391053991 is 19935019313.

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 31391053991 - 2¹⁰ = 31391052967 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 (31391050991) 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, 20095925 + ... + 20097486.

It is an arithmetic number, because the mean of its divisors is an integer number (4340888496).

Almost surely, 2^31391053991 is an apocalyptic number.

31391053991 is a deficient number, since it is larger than the sum of its proper divisors (3336053977).

31391053991 is a wasteful number, since it uses less digits than its factorization.

31391053991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40193493.

The product of its (nonzero) digits is 98415, while the sum is 44.

The spelling of 31391053991 in words is "thirty-one billion, three hundred ninety-one million, fifty-three thousand, nine hundred ninety-one".