216425961 has 6 divisors (see below), whose sum is σ = 312615290. Its totient is φ = 144283968.

The previous prime is 216425899. The next prime is 216425971. The reversal of 216425961 is 169524612.

216425961 is a `hidden beast` number, since 2 + 1 + 64 + 2 + 596 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 195440400 + 20985561 = 13980^2 + 4581^2 .

It is not a de Polignac number, because 216425961 - 2⁶ = 216425897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216425971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12023656 + ... + 12023673.

Almost surely, 2^216425961 is an apocalyptic number.

It is an amenable number.

216425961 is a deficient number, since it is larger than the sum of its proper divisors (96189329).

216425961 is a wasteful number, since it uses less digits than its factorization.

216425961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24047335 (or 24047332 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 216425961 is about 14711.4228067852. The cubic root of 216425961 is about 600.3941493538.

The spelling of 216425961 in words is "two hundred sixteen million, four hundred twenty-five thousand, nine hundred sixty-one".