30691890875 has 8 divisors (see below), whose sum is σ = 38303479968. Its totient is φ = 24553512600.

The previous prime is 30691890871. The next prime is 30691890877. The reversal of 30691890875 is 57809819603.

It is not a de Polignac number, because 30691890875 - 2² = 30691890871 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30691890875.

It is not an unprimeable number, because it can be changed into a prime (30691890871) 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, 122767439 + ... + 122767688.

It is an arithmetic number, because the mean of its divisors is an integer number (4787934996).

Almost surely, 2^30691890875 is an apocalyptic number.

30691890875 is a deficient number, since it is larger than the sum of its proper divisors (7611589093).

30691890875 is an equidigital number, since it uses as much as digits as its factorization.

30691890875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245535142 (or 245535132 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 56.

It can be divided in two parts, 306918 and 90875, that added together give a palindrome (397793).

The spelling of 30691890875 in words is "thirty billion, six hundred ninety-one million, eight hundred ninety thousand, eight hundred seventy-five".