51172553 has 2 divisors, whose sum is σ = 51172554. Its totient is φ = 51172552.

The previous prime is 51172549. The next prime is 51172573. The reversal of 51172553 is 35527115.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47224384 + 3948169 = 6872^2 + 1987^2 .

It is a cyclic number.

It is not a de Polignac number, because 51172553 - 2² = 51172549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51172543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25586276 + 25586277.

It is an arithmetic number, because the mean of its divisors is an integer number (25586277).

Almost surely, 2^51172553 is an apocalyptic number.

It is an amenable number.

51172553 is a deficient number, since it is larger than the sum of its proper divisors (1).

51172553 is an equidigital number, since it uses as much as digits as its factorization.

51172553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5250, while the sum is 29.

The square root of 51172553 is about 7153.4993534633. The cubic root of 51172553 is about 371.2607418659.

Adding to 51172553 its reverse (35527115), we get a palindrome (86699668).

The spelling of 51172553 in words is "fifty-one million, one hundred seventy-two thousand, five hundred fifty-three".