518949157 has 4 divisors (see below), whose sum is σ = 549475596. Its totient is φ = 488422720.

The previous prime is 518949149. The next prime is 518949163. The reversal of 518949157 is 751949815.

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

It can be written as a sum of positive squares in 2 ways, for example, as 153412996 + 365536161 = 12386^2 + 19119^2 .

It is a cyclic number.

It is not a de Polignac number, because 518949157 - 2³ = 518949149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 518949157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518944157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15263194 + ... + 15263227.

It is an arithmetic number, because the mean of its divisors is an integer number (137368899).

Almost surely, 2^518949157 is an apocalyptic number.

It is an amenable number.

518949157 is a deficient number, since it is larger than the sum of its proper divisors (30526439).

518949157 is a wasteful number, since it uses less digits than its factorization.

518949157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30526438.

The product of its digits is 453600, while the sum is 49.

The square root of 518949157 is about 22780.4555924591. The cubic root of 518949157 is about 803.6031003264.

The spelling of 518949157 in words is "five hundred eighteen million, nine hundred forty-nine thousand, one hundred fifty-seven".