51445531 has 2 divisors, whose sum is σ = 51445532. Its totient is φ = 51445530.

The previous prime is 51445517. The next prime is 51445561. The reversal of 51445531 is 13554415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51445531 - 2⁹ = 51445019 is a prime.

It is a super-2 number, since 2×51445531² = 5293285319743922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51445531.

It is not a weakly prime, because it can be changed into another prime (51445561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25722765 + 25722766.

It is an arithmetic number, because the mean of its divisors is an integer number (25722766).

Almost surely, 2^51445531 is an apocalyptic number.

51445531 is a deficient number, since it is larger than the sum of its proper divisors (1).

51445531 is an equidigital number, since it uses as much as digits as its factorization.

51445531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6000, while the sum is 28.

The square root of 51445531 is about 7172.5540081619. The cubic root of 51445531 is about 371.9197301467.

Adding to 51445531 its reverse (13554415), we get a palindrome (64999946).

The spelling of 51445531 in words is "fifty-one million, four hundred forty-five thousand, five hundred thirty-one".