13099731 has 4 divisors (see below), whose sum is σ = 17466312. Its totient is φ = 8733152.

The previous prime is 13099727. The next prime is 13099771. The reversal of 13099731 is 13799031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13799031 = 3 ⋅4599677.

It is a cyclic number.

It is not a de Polignac number, because 13099731 - 2² = 13099727 is a prime.

It is a super-2 number, since 2×13099731² = 343205904544722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13099692 and 13099701.

It is not an unprimeable number, because it can be changed into a prime (13099771) 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, 2183286 + ... + 2183291.

It is an arithmetic number, because the mean of its divisors is an integer number (4366578).

Almost surely, 2^13099731 is an apocalyptic number.

13099731 is a deficient number, since it is larger than the sum of its proper divisors (4366581).

13099731 is an equidigital number, since it uses as much as digits as its factorization.

13099731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4366580.

The product of its (nonzero) digits is 5103, while the sum is 33.

The square root of 13099731 is about 3619.3550530447. The cubic root of 13099731 is about 235.7332221964.

The spelling of 13099731 in words is "thirteen million, ninety-nine thousand, seven hundred thirty-one".