216413631 has 24 divisors (see below), whose sum is σ = 369576480. Its totient is φ = 119399616.

The previous prime is 216413581. The next prime is 216413671. The reversal of 216413631 is 136314612.

216413631 is a `hidden beast` number, since 2 + 16 + 4 + 13 + 631 = 666.

It is not a de Polignac number, because 216413631 - 2⁷ = 216413503 is a prime.

It is a super-2 number, since 2×216413631² = 93669719365208322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216413595 and 216413604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216413671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57400 + ... + 61053.

It is an arithmetic number, because the mean of its divisors is an integer number (15399020).

Almost surely, 2^216413631 is an apocalyptic number.

216413631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

216413631 is a deficient number, since it is larger than the sum of its proper divisors (153162849).

216413631 is a wasteful number, since it uses less digits than its factorization.

216413631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118495 (or 118492 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 216413631 is about 14711.0037386985. The cubic root of 216413631 is about 600.3827474554.

The spelling of 216413631 in words is "two hundred sixteen million, four hundred thirteen thousand, six hundred thirty-one".