51731549 has 2 divisors, whose sum is σ = 51731550. Its totient is φ = 51731548.

The previous prime is 51731501. The next prime is 51731569. The reversal of 51731549 is 94513715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45995524 + 5736025 = 6782^2 + 2395^2 .

It is a cyclic number.

It is not a de Polignac number, because 51731549 - 2⁸ = 51731293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51731569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25865774 + 25865775.

It is an arithmetic number, because the mean of its divisors is an integer number (25865775).

Almost surely, 2^51731549 is an apocalyptic number.

It is an amenable number.

51731549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51731549 is an equidigital number, since it uses as much as digits as its factorization.

51731549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 35.

The square root of 51731549 is about 7192.4647374874. The cubic root of 51731549 is about 372.6077018419.

The spelling of 51731549 in words is "fifty-one million, seven hundred thirty-one thousand, five hundred forty-nine".