51390757 has 12 divisors (see below), whose sum is σ = 56766528. Its totient is φ = 46488200.

The previous prime is 51390751. The next prime is 51390791. The reversal of 51390757 is 75709315.

It is a happy number.

It is not a de Polignac number, because 51390757 - 2³ = 51390749 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51390751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26532 + ... + 28402.

It is an arithmetic number, because the mean of its divisors is an integer number (4730544).

Almost surely, 2^51390757 is an apocalyptic number.

It is an amenable number.

51390757 is a deficient number, since it is larger than the sum of its proper divisors (5375771).

51390757 is a wasteful number, since it uses less digits than its factorization.

51390757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120 (or 2109 counting only the distinct ones).

The product of its (nonzero) digits is 33075, while the sum is 37.

The square root of 51390757 is about 7168.7346861214. The cubic root of 51390757 is about 371.7876890990.

The spelling of 51390757 in words is "fifty-one million, three hundred ninety thousand, seven hundred fifty-seven".