13615531 has 2 divisors, whose sum is σ = 13615532. Its totient is φ = 13615530.

The previous prime is 13615513. The next prime is 13615549. The reversal of 13615531 is 13551631.

Together with previous prime (13615513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (13615513) and next prime (13615549).

It is a cyclic number.

It is not a de Polignac number, because 13615531 - 2¹³ = 13607339 is a prime.

It is a super-2 number, since 2×13615531² = 370765368823922, which contains 22 as substring.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 13615496 and 13615505.

It is not a weakly prime, because it can be changed into another prime (13615331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6807765 + 6807766.

It is an arithmetic number, because the mean of its divisors is an integer number (6807766).

Almost surely, 2^13615531 is an apocalyptic number.

13615531 is a deficient number, since it is larger than the sum of its proper divisors (1).

13615531 is an equidigital number, since it uses as much as digits as its factorization.

13615531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 25.

The square root of 13615531 is about 3689.9228989235. The cubic root of 13615531 is about 238.7874665030.

The spelling of 13615531 in words is "thirteen million, six hundred fifteen thousand, five hundred thirty-one".