31145414020251 has 4 divisors (see below), whose sum is σ = 41527218693672. Its totient is φ = 20763609346832.

The previous prime is 31145414020247. The next prime is 31145414020267. The reversal of 31145414020251 is 15202041454113.

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 31145414020251 - 2² = 31145414020247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31145414028251) 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, 5190902336706 + ... + 5190902336711.

It is an arithmetic number, because the mean of its divisors is an integer number (10381804673418).

Almost surely, 2^{31145414020251} is an apocalyptic number.

31145414020251 is a deficient number, since it is larger than the sum of its proper divisors (10381804673421).

31145414020251 is a wasteful number, since it uses less digits than its factorization.

31145414020251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10381804673420.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 31145414020251 its reverse (15202041454113), we get a palindrome (46347455474364).

The spelling of 31145414020251 in words is "thirty-one trillion, one hundred forty-five billion, four hundred fourteen million, twenty thousand, two hundred fifty-one".