995721157 has 2 divisors, whose sum is σ = 995721158. Its totient is φ = 995721156.

The previous prime is 995721113. The next prime is 995721187. The reversal of 995721157 is 751127599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 517380516 + 478340641 = 22746^2 + 21871^2 .

It is an emirp because it is prime and its reverse (751127599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 995721157 - 2¹⁹ = 995196869 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (995721107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497860578 + 497860579.

It is an arithmetic number, because the mean of its divisors is an integer number (497860579).

Almost surely, 2^995721157 is an apocalyptic number.

It is an amenable number.

995721157 is a deficient number, since it is larger than the sum of its proper divisors (1).

995721157 is an equidigital number, since it uses as much as digits as its factorization.

995721157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198450, while the sum is 46.

The square root of 995721157 is about 31555.0496275953. The cubic root of 995721157 is about 998.5716798729.

The spelling of 995721157 in words is "nine hundred ninety-five million, seven hundred twenty-one thousand, one hundred fifty-seven".