51971757 has 8 divisors (see below), whose sum is σ = 69447840. Its totient is φ = 34571760.

The previous prime is 51971753. The next prime is 51971767. The reversal of 51971757 is 75717915.

It is a happy number.

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

It is not a de Polignac number, because 51971757 - 2² = 51971753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51971753) 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, 17407 + ... + 20172.

It is an arithmetic number, because the mean of its divisors is an integer number (8680980).

Almost surely, 2^51971757 is an apocalyptic number.

It is an amenable number.

51971757 is a deficient number, since it is larger than the sum of its proper divisors (17476083).

51971757 is a wasteful number, since it uses less digits than its factorization.

51971757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38043.

The product of its digits is 77175, while the sum is 42.

The square root of 51971757 is about 7209.1439852454. The cubic root of 51971757 is about 373.1835282435.

The spelling of 51971757 in words is "fifty-one million, nine hundred seventy-one thousand, seven hundred fifty-seven".