15487531 has 2 divisors, whose sum is σ = 15487532. Its totient is φ = 15487530.

The previous prime is 15487517. The next prime is 15487541. The reversal of 15487531 is 13578451.

It is a happy number.

15487531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (13578451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15487531 - 2⁷ = 15487403 is a prime.

It is a super-2 number, since 2×15487531² = 479727232951922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15487541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7743765 + 7743766.

It is an arithmetic number, because the mean of its divisors is an integer number (7743766).

Almost surely, 2^15487531 is an apocalyptic number.

15487531 is a deficient number, since it is larger than the sum of its proper divisors (1).

15487531 is an equidigital number, since it uses as much as digits as its factorization.

15487531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 34.

The square root of 15487531 is about 3935.4200538189. The cubic root of 15487531 is about 249.2646712873.

The spelling of 15487531 in words is "fifteen million, four hundred eighty-seven thousand, five hundred thirty-one".