51723137 has 2 divisors, whose sum is σ = 51723138. Its totient is φ = 51723136.

The previous prime is 51723127. The next prime is 51723143. The reversal of 51723137 is 73132715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50183056 + 1540081 = 7084^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 51723137 - 2¹⁰ = 51722113 is a prime.

It is a super-2 number, since 2×51723137² = 5350565802241538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51723107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25861568 + 25861569.

It is an arithmetic number, because the mean of its divisors is an integer number (25861569).

Almost surely, 2^51723137 is an apocalyptic number.

It is an amenable number.

51723137 is a deficient number, since it is larger than the sum of its proper divisors (1).

51723137 is an equidigital number, since it uses as much as digits as its factorization.

51723137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4410, while the sum is 29.

The square root of 51723137 is about 7191.8799350378. The cubic root of 51723137 is about 372.5875043289.

The spelling of 51723137 in words is "fifty-one million, seven hundred twenty-three thousand, one hundred thirty-seven".