51495121 has 2 divisors, whose sum is σ = 51495122. Its totient is φ = 51495120.

The previous prime is 51495113. The next prime is 51495151. The reversal of 51495121 is 12159415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51322896 + 172225 = 7164^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 51495121 - 2³ = 51495113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51495121.

It is not a weakly prime, because it can be changed into another prime (51495151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25747560 + 25747561.

It is an arithmetic number, because the mean of its divisors is an integer number (25747561).

Almost surely, 2^51495121 is an apocalyptic number.

It is an amenable number.

51495121 is a deficient number, since it is larger than the sum of its proper divisors (1).

51495121 is an equidigital number, since it uses as much as digits as its factorization.

51495121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 28.

The square root of 51495121 is about 7176.0101031144. The cubic root of 51495121 is about 372.0391935619.

It can be divided in two parts, 51 and 495121, that multiplied together give a triangular number (25251171 = T₇₁₀₆).

The spelling of 51495121 in words is "fifty-one million, four hundred ninety-five thousand, one hundred twenty-one".