51351531 has 64 divisors (see below), whose sum is σ = 90243072. Its totient is φ = 25200000.

The previous prime is 51351529. The next prime is 51351533. The reversal of 51351531 is 13515315.

It is an interprime number because it is at equal distance from previous prime (51351529) and next prime (51351533).

It is not a de Polignac number, because 51351531 - 2¹ = 51351529 is a prime.

It is a super-2 number, since 2×51351531² = 5273959472087922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51351533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 508381 + ... + 508481.

It is an arithmetic number, because the mean of its divisors is an integer number (1410048).

Almost surely, 2^51351531 is an apocalyptic number.

51351531 is a deficient number, since it is larger than the sum of its proper divisors (38891541).

51351531 is a wasteful number, since it uses less digits than its factorization.

51351531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224.

The product of its digits is 1125, while the sum is 24.

The square root of 51351531 is about 7165.9982556515. The cubic root of 51351531 is about 371.6930712024.

Adding to 51351531 its reverse (13515315), we get a palindrome (64866846).

It can be divided in two parts, 5135 and 1531, that added together give a palindrome (6666).

The spelling of 51351531 in words is "fifty-one million, three hundred fifty-one thousand, five hundred thirty-one".