31061855899 has 4 divisors (see below), whose sum is σ = 32696690440. Its totient is φ = 29427021360.

The previous prime is 31061855893. The next prime is 31061855927. The reversal of 31061855899 is 99855816013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31061855899 - 2¹⁵ = 31061823131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31061855893) 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, 817417242 + ... + 817417279.

It is an arithmetic number, because the mean of its divisors is an integer number (8174172610).

Almost surely, 2^31061855899 is an apocalyptic number.

31061855899 is a deficient number, since it is larger than the sum of its proper divisors (1634834541).

31061855899 is a wasteful number, since it uses less digits than its factorization.

31061855899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634834540.

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 31061855899 in words is "thirty-one billion, sixty-one million, eight hundred fifty-five thousand, eight hundred ninety-nine".