51241531 has 4 divisors (see below), whose sum is σ = 55899864. Its totient is φ = 46583200.

The previous prime is 51241529. The next prime is 51241549. The reversal of 51241531 is 13514215.

It is a happy number.

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 51241531 - 2¹ = 51241529 is a prime.

It is a super-2 number, since 2×51241531² = 5251388998447922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51241571) 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, 2329150 + ... + 2329171.

It is an arithmetic number, because the mean of its divisors is an integer number (13974966).

Almost surely, 2^51241531 is an apocalyptic number.

51241531 is a deficient number, since it is larger than the sum of its proper divisors (4658333).

51241531 is a wasteful number, since it uses less digits than its factorization.

51241531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4658332.

The product of its digits is 600, while the sum is 22.

The square root of 51241531 is about 7158.3190065825. The cubic root of 51241531 is about 371.4274805054.

Adding to 51241531 its reverse (13514215), we get a palindrome (64755746).

The spelling of 51241531 in words is "fifty-one million, two hundred forty-one thousand, five hundred thirty-one".