51971758 has 4 divisors (see below), whose sum is σ = 77957640. Its totient is φ = 25985878.

The previous prime is 51971753. The next prime is 51971767. The reversal of 51971758 is 85717915.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×51971758² = 5402127259221128, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 12992938 + ... + 12992941.

It is an arithmetic number, because the mean of its divisors is an integer number (19489410).

Almost surely, 2^51971758 is an apocalyptic number.

51971758 is a deficient number, since it is larger than the sum of its proper divisors (25985882).

51971758 is a wasteful number, since it uses less digits than its factorization.

51971758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25985881.

The product of its digits is 88200, while the sum is 43.

The square root of 51971758 is about 7209.1440546018. The cubic root of 51971758 is about 373.1835306370.

The spelling of 51971758 in words is "fifty-one million, nine hundred seventy-one thousand, seven hundred fifty-eight".