2187220631 has 2 divisors, whose sum is σ = 2187220632. Its totient is φ = 2187220630.

The previous prime is 2187220619. The next prime is 2187220691. The reversal of 2187220631 is 1360227812.

2187220631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2187220631 - 2¹⁰ = 2187219607 is a prime.

It is a super-2 number, since 2×2187220631² = 9567868177344076322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2187220601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093610315 + 1093610316.

It is an arithmetic number, because the mean of its divisors is an integer number (1093610316).

Almost surely, 2^2187220631 is an apocalyptic number.

2187220631 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187220631 is an equidigital number, since it uses as much as digits as its factorization.

2187220631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 2187220631 is about 46767.7306590773. The cubic root of 2187220631 is about 1298.0682613240.

The spelling of 2187220631 in words is "two billion, one hundred eighty-seven million, two hundred twenty thousand, six hundred thirty-one".