51381757 has 8 divisors (see below), whose sum is σ = 61812800. Its totient is φ = 41723424.

The previous prime is 51381749. The next prime is 51381797. The reversal of 51381757 is 75718315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51381757 - 2³ = 51381749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51381797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193032 + ... + 193297.

It is an arithmetic number, because the mean of its divisors is an integer number (7726600).

Almost surely, 2^51381757 is an apocalyptic number.

It is an amenable number.

51381757 is a deficient number, since it is larger than the sum of its proper divisors (10431043).

51381757 is a wasteful number, since it uses less digits than its factorization.

51381757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386355.

The product of its digits is 29400, while the sum is 37.

The square root of 51381757 is about 7168.1069327961. The cubic root of 51381757 is about 371.7659842585.

The spelling of 51381757 in words is "fifty-one million, three hundred eighty-one thousand, seven hundred fifty-seven".