15142040809 has 9 divisors (see below), whose sum is σ = 17615212797. Its totient is φ = 12978153804.

The previous prime is 15142040783. The next prime is 15142040819. The reversal of 15142040809 is 90804024151.

It is a happy number.

The square root of 15142040809 is 123053.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 15142040809 - 2⁷ = 15142040681 is a prime.

It is a super-2 number, since 2×15142040809² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15142040819) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 852582 + ... + 870160.

Almost surely, 2^15142040809 is an apocalyptic number.

15142040809 is the 123053-rd square number.

15142040809 is the 61527-th centered octagonal number.

It is an amenable number.

15142040809 is a deficient number, since it is larger than the sum of its proper divisors (2473171988).

15142040809 is an frugal number, since it uses more digits than its factorization.

15142040809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35172 (or 17586 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 15142040809 in words is "fifteen billion, one hundred forty-two million, forty thousand, eight hundred nine".