31281768797 has 4 divisors (see below), whose sum is σ = 31316258976. Its totient is φ = 31247278620.

The previous prime is 31281768781. The next prime is 31281768887. The reversal of 31281768797 is 79786718213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79786718213 = 139 ⋅574005167.

It is a cyclic number.

It is not a de Polignac number, because 31281768797 - 2⁴ = 31281768781 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 (31281768767) 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, 17243729 + ... + 17245542.

It is an arithmetic number, because the mean of its divisors is an integer number (7829064744).

Almost surely, 2^31281768797 is an apocalyptic number.

It is an amenable number.

31281768797 is a deficient number, since it is larger than the sum of its proper divisors (34490179).

31281768797 is an equidigital number, since it uses as much as digits as its factorization.

31281768797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34490178.

The product of its digits is 7112448, while the sum is 59.

The spelling of 31281768797 in words is "thirty-one billion, two hundred eighty-one million, seven hundred sixty-eight thousand, seven hundred ninety-seven".