1513888157 has 4 divisors (see below), whose sum is σ = 1513967580. Its totient is φ = 1513808736.

The previous prime is 1513888151. The next prime is 1513888169. The reversal of 1513888157 is 7518883151.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7518883151 = 13 ⋅578375627.

It can be written as a sum of positive squares in 2 ways, for example, as 438441721 + 1075446436 = 20939^2 + 32794^2 .

It is a cyclic number.

It is not a de Polignac number, because 1513888157 - 2⁶ = 1513888093 is a prime.

It is a deceptive number, since it divides R_1513888156.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1513888151) 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, 7943 + ... + 55595.

It is an arithmetic number, because the mean of its divisors is an integer number (378491895).

It is a Poulet number, since it divides 2^1513888156-1.

Almost surely, 2^1513888157 is an apocalyptic number.

1513888157 is the 31769-th pentagonal number.

It is an amenable number.

1513888157 is a deficient number, since it is larger than the sum of its proper divisors (79423).

1513888157 is an equidigital number, since it uses as much as digits as its factorization.

1513888157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79422.

The product of its digits is 268800, while the sum is 47.

The square root of 1513888157 is about 38908.7156945587. The cubic root of 1513888157 is about 1148.2362773815.

The spelling of 1513888157 in words is "one billion, five hundred thirteen million, eight hundred eighty-eight thousand, one hundred fifty-seven".