31145214251 has 16 divisors (see below), whose sum is σ = 32175360000. Its totient is φ = 30131162880.

The previous prime is 31145214209. The next prime is 31145214253. The reversal of 31145214251 is 15241254113.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31145214251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31145214253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4149500 + ... + 4156998.

It is an arithmetic number, because the mean of its divisors is an integer number (2010960000).

Almost surely, 2^31145214251 is an apocalyptic number.

31145214251 is a deficient number, since it is larger than the sum of its proper divisors (1030145749).

31145214251 is an equidigital number, since it uses as much as digits as its factorization.

31145214251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8554.

The product of its digits is 4800, while the sum is 29.

Adding to 31145214251 its reverse (15241254113), we get a palindrome (46386468364).

The spelling of 31145214251 in words is "thirty-one billion, one hundred forty-five million, two hundred fourteen thousand, two hundred fifty-one".