16513531 has 2 divisors, whose sum is σ = 16513532. Its totient is φ = 16513530.

The previous prime is 16513513. The next prime is 16513537. The reversal of 16513531 is 13531561.

Together with previous prime (16513513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16513531 - 2¹¹ = 16511483 is a prime.

It is a super-2 number, since 2×16513531² = 545393412175922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16513496 and 16513505.

It is not a weakly prime, because it can be changed into another prime (16513537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8256765 + 8256766.

It is an arithmetic number, because the mean of its divisors is an integer number (8256766).

Almost surely, 2^16513531 is an apocalyptic number.

16513531 is a deficient number, since it is larger than the sum of its proper divisors (1).

16513531 is an equidigital number, since it uses as much as digits as its factorization.

16513531 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 16513531 is about 4063.6844119592. The cubic root of 16513531 is about 254.6517404045.

The spelling of 16513531 in words is "sixteen million, five hundred thirteen thousand, five hundred thirty-one".