31292168081 has 4 divisors (see below), whose sum is σ = 32652697152. Its totient is φ = 29931639012.

The previous prime is 31292168057. The next prime is 31292168111. The reversal of 31292168081 is 18086129213.

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.

It is a cyclic number.

It is not a de Polignac number, because 31292168081 - 2¹⁰ = 31292167057 is a prime.

It is a super-2 number, since 2×31292168081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31292168581) 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, 680264501 + ... + 680264546.

It is an arithmetic number, because the mean of its divisors is an integer number (8163174288).

Almost surely, 2^31292168081 is an apocalyptic number.

It is an amenable number.

31292168081 is a deficient number, since it is larger than the sum of its proper divisors (1360529071).

31292168081 is a wasteful number, since it uses less digits than its factorization.

31292168081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360529070.

The product of its (nonzero) digits is 41472, while the sum is 41.

The spelling of 31292168081 in words is "thirty-one billion, two hundred ninety-two million, one hundred sixty-eight thousand, eighty-one".