13501987 has 2 divisors, whose sum is σ = 13501988. Its totient is φ = 13501986.

The previous prime is 13501979. The next prime is 13501993. The reversal of 13501987 is 78910531.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13501987 - 2³ = 13501979 is a prime.

It is not a weakly prime, because it can be changed into another prime (13501087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6750993 + 6750994.

It is an arithmetic number, because the mean of its divisors is an integer number (6750994).

Almost surely, 2^13501987 is an apocalyptic number.

13501987 is a deficient number, since it is larger than the sum of its proper divisors (1).

13501987 is an equidigital number, since it uses as much as digits as its factorization.

13501987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 13501987 is about 3674.5050006770. The cubic root of 13501987 is about 238.1218393180.

The spelling of 13501987 in words is "thirteen million, five hundred one thousand, nine hundred eighty-seven".