13531939 has 2 divisors, whose sum is σ = 13531940. Its totient is φ = 13531938.

The previous prime is 13531919. The next prime is 13531943. The reversal of 13531939 is 93913531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13531939 - 2⁷ = 13531811 is a prime.

It is a super-2 number, since 2×13531939² = 366226746199442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13531919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765969 + 6765970.

It is an arithmetic number, because the mean of its divisors is an integer number (6765970).

Almost surely, 2^13531939 is an apocalyptic number.

13531939 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531939 is an equidigital number, since it uses as much as digits as its factorization.

13531939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10935, while the sum is 34.

The square root of 13531939 is about 3678.5783938908. The cubic root of 13531939 is about 238.2977876907.

The spelling of 13531939 in words is "thirteen million, five hundred thirty-one thousand, nine hundred thirty-nine".