51137117 has 2 divisors, whose sum is σ = 51137118. Its totient is φ = 51137116.

The previous prime is 51137069. The next prime is 51137143. The reversal of 51137117 is 71173115.

It is an a-pointer prime, because the next prime (51137143) can be obtained adding 51137117 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29365561 + 21771556 = 5419^2 + 4666^2 .

It is a cyclic number.

It is not a de Polignac number, because 51137117 - 2¹² = 51133021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51137167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25568558 + 25568559.

It is an arithmetic number, because the mean of its divisors is an integer number (25568559).

Almost surely, 2^51137117 is an apocalyptic number.

It is an amenable number.

51137117 is a deficient number, since it is larger than the sum of its proper divisors (1).

51137117 is an equidigital number, since it uses as much as digits as its factorization.

51137117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 735, while the sum is 26.

The square root of 51137117 is about 7151.0220947778. The cubic root of 51137117 is about 371.1750251239.

The spelling of 51137117 in words is "fifty-one million, one hundred thirty-seven thousand, one hundred seventeen".