51122531 has 4 divisors (see below), whose sum is σ = 52369464. Its totient is φ = 49875600.

The previous prime is 51122507. The next prime is 51122549. The reversal of 51122531 is 13522115.

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 51122531 - 2¹⁰ = 51121507 is a prime.

It is a super-2 number, since 2×51122531² = 5227026351691922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51122501) 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, 623405 + ... + 623486.

It is an arithmetic number, because the mean of its divisors is an integer number (13092366).

Almost surely, 2^51122531 is an apocalyptic number.

51122531 is a deficient number, since it is larger than the sum of its proper divisors (1246933).

51122531 is a wasteful number, since it uses less digits than its factorization.

51122531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246932.

The product of its digits is 300, while the sum is 20.

The square root of 51122531 is about 7150.0021678318. The cubic root of 51122531 is about 371.1397312965.

Adding to 51122531 its reverse (13522115), we get a palindrome (64644646).

The spelling of 51122531 in words is "fifty-one million, one hundred twenty-two thousand, five hundred thirty-one".