13520031 has 20 divisors (see below), whose sum is σ = 21041112. Its totient is φ = 7721616.

The previous prime is 13520011. The next prime is 13520047. The reversal of 13520031 is 13002531.

It is a happy number.

It is not a de Polignac number, because 13520031 - 2⁶ = 13519967 is a prime.

It is a super-2 number, since 2×13520031² = 365582476481922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13520011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6265 + ... + 8141.

Almost surely, 2^13520031 is an apocalyptic number.

13520031 is a deficient number, since it is larger than the sum of its proper divisors (7521081).

13520031 is an frugal number, since it uses more digits than its factorization.

13520031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908 (or 1887 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 13520031 is about 3676.9594776119. The cubic root of 13520031 is about 238.2278671165.

Adding to 13520031 its reverse (13002531), we get a palindrome (26522562).

The spelling of 13520031 in words is "thirteen million, five hundred twenty thousand, thirty-one".