65398531 has 4 divisors (see below), whose sum is σ = 71343864. Its totient is φ = 59453200.

The previous prime is 65398519. The next prime is 65398537. The reversal of 65398531 is 13589356.

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 65398531 - 2²³ = 57009923 is a prime.

It is a super-2 number, since 2×65398531² = 8553935713915922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65398537) 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, 2972650 + ... + 2972671.

It is an arithmetic number, because the mean of its divisors is an integer number (17835966).

Almost surely, 2^65398531 is an apocalyptic number.

65398531 is a deficient number, since it is larger than the sum of its proper divisors (5945333).

65398531 is a wasteful number, since it uses less digits than its factorization.

65398531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5945332.

The product of its digits is 97200, while the sum is 40.

The square root of 65398531 is about 8086.9358226710. The cubic root of 65398531 is about 402.8926374471.

The spelling of 65398531 in words is "sixty-five million, three hundred ninety-eight thousand, five hundred thirty-one".