65220131 has 4 divisors (see below), whose sum is σ = 65658000. Its totient is φ = 64782264.

The previous prime is 65220059. The next prime is 65220137. The reversal of 65220131 is 13102256.

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 65220131 - 2²² = 61025827 is a prime.

It is a super-2 number, since 2×65220131² = 8507330975314322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65220137) 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, 218711 + ... + 219008.

It is an arithmetic number, because the mean of its divisors is an integer number (16414500).

Almost surely, 2^65220131 is an apocalyptic number.

65220131 is a deficient number, since it is larger than the sum of its proper divisors (437869).

65220131 is a wasteful number, since it uses less digits than its factorization.

65220131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437868.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 65220131 is about 8075.8981543851. The cubic root of 65220131 is about 402.5259548866.

Adding to 65220131 its reverse (13102256), we get a palindrome (78322387).

The spelling of 65220131 in words is "sixty-five million, two hundred twenty thousand, one hundred thirty-one".