65551531 has 8 divisors (see below), whose sum is σ = 68274144. Its totient is φ = 62879040.

The previous prime is 65551523. The next prime is 65551543. The reversal of 65551531 is 13515556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65551531 - 2³ = 65551523 is a prime.

It is a super-2 number, since 2×65551531² = 8594006432887922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65551493 and 65551502.

It is not an unprimeable number, because it can be changed into a prime (65551231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9850 + ... + 15103.

It is an arithmetic number, because the mean of its divisors is an integer number (8534268).

Almost surely, 2^65551531 is an apocalyptic number.

65551531 is a deficient number, since it is larger than the sum of its proper divisors (2722613).

65551531 is a wasteful number, since it uses less digits than its factorization.

65551531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25061.

The product of its digits is 11250, while the sum is 31.

The square root of 65551531 is about 8096.3899980176. The cubic root of 65551531 is about 403.2065821387.

The spelling of 65551531 in words is "sixty-five million, five hundred fifty-one thousand, five hundred thirty-one".