13520431 has 2 divisors, whose sum is σ = 13520432. Its totient is φ = 13520430.

The previous prime is 13520417. The next prime is 13520449. The reversal of 13520431 is 13402531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13520431 - 2⁷ = 13520303 is a prime.

It is a super-2 number, since 2×13520431² = 365604108851522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13520399 and 13520408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13520411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6760215 + 6760216.

It is an arithmetic number, because the mean of its divisors is an integer number (6760216).

Almost surely, 2^13520431 is an apocalyptic number.

13520431 is a deficient number, since it is larger than the sum of its proper divisors (1).

13520431 is an equidigital number, since it uses as much as digits as its factorization.

13520431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 13520431 is about 3677.0138699766. The cubic root of 13520431 is about 238.2302164752.

Adding to 13520431 its reverse (13402531), we get a palindrome (26922962).

The spelling of 13520431 in words is "thirteen million, five hundred twenty thousand, four hundred thirty-one".