51970157 has 8 divisors (see below), whose sum is σ = 53314200. Its totient is φ = 50639680.

The previous prime is 51970147. The next prime is 51970159. The reversal of 51970157 is 75107915.

It can be written as a sum of positive squares in 4 ways, for example, as 1190281 + 50779876 = 1091^2 + 7126^2 .

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 51970157 - 2⁴ = 51970141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51970159) 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, 4607 + ... + 11187.

It is an arithmetic number, because the mean of its divisors is an integer number (6664275).

Almost surely, 2^51970157 is an apocalyptic number.

It is an amenable number.

51970157 is a deficient number, since it is larger than the sum of its proper divisors (1344043).

51970157 is a wasteful number, since it uses less digits than its factorization.

51970157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783.

The product of its (nonzero) digits is 11025, while the sum is 35.

The square root of 51970157 is about 7209.0330142121. The cubic root of 51970157 is about 373.1796986008.

The spelling of 51970157 in words is "fifty-one million, nine hundred seventy thousand, one hundred fifty-seven".