215253237631 has 4 divisors (see below), whose sum is σ = 215258491000. Its totient is φ = 215247984264.

The previous prime is 215253237629. The next prime is 215253237643. The reversal of 215253237631 is 136732352512.

It is a happy number.

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 215253237631 - 2¹ = 215253237629 is a prime.

It is a super-2 number, since 2×215253237631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215253231631) 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, 2564736 + ... + 2647333.

It is an arithmetic number, because the mean of its divisors is an integer number (53814622750).

Almost surely, 2^215253237631 is an apocalyptic number.

215253237631 is a deficient number, since it is larger than the sum of its proper divisors (5253369).

215253237631 is an equidigital number, since it uses as much as digits as its factorization.

215253237631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5253368.

The product of its digits is 226800, while the sum is 40.

The spelling of 215253237631 in words is "two hundred fifteen billion, two hundred fifty-three million, two hundred thirty-seven thousand, six hundred thirty-one".