65531145 has 32 divisors (see below), whose sum is σ = 106997760. Its totient is φ = 34242560.

The previous prime is 65531143. The next prime is 65531173. The reversal of 65531145 is 54113556.

It is not a de Polignac number, because 65531145 - 2¹ = 65531143 is a prime.

It is a super-2 number, since 2×65531145² = 8588661930022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65531143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254857 + ... + 255113.

It is an arithmetic number, because the mean of its divisors is an integer number (3343680).

Almost surely, 2^65531145 is an apocalyptic number.

It is an amenable number.

65531145 is a deficient number, since it is larger than the sum of its proper divisors (41466615).

65531145 is a wasteful number, since it uses less digits than its factorization.

65531145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545.

The product of its digits is 9000, while the sum is 30.

The square root of 65531145 is about 8095.1309439687. The cubic root of 65531145 is about 403.1647798014.

The spelling of 65531145 in words is "sixty-five million, five hundred thirty-one thousand, one hundred forty-five".