65131251 has 4 divisors (see below), whose sum is σ = 86841672. Its totient is φ = 43420832.

The previous prime is 65131249. The next prime is 65131271. The reversal of 65131251 is 15213156.

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 65131251 - 2¹ = 65131249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65131271) 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, 10855206 + ... + 10855211.

It is an arithmetic number, because the mean of its divisors is an integer number (21710418).

Almost surely, 2^65131251 is an apocalyptic number.

65131251 is a deficient number, since it is larger than the sum of its proper divisors (21710421).

65131251 is a wasteful number, since it uses less digits than its factorization.

65131251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21710420.

The product of its digits is 900, while the sum is 24.

The square root of 65131251 is about 8070.3934848308. The cubic root of 65131251 is about 402.3430217424.

The spelling of 65131251 in words is "sixty-five million, one hundred thirty-one thousand, two hundred fifty-one".