16315531 has 2 divisors, whose sum is σ = 16315532. Its totient is φ = 16315530.

The previous prime is 16315511. The next prime is 16315561. The reversal of 16315531 is 13551361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16315531 - 2¹¹ = 16313483 is a prime.

It is a super-2 number, since 2×16315531² = 532393103623922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16315496 and 16315505.

It is not a weakly prime, because it can be changed into another prime (16315501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8157765 + 8157766.

It is an arithmetic number, because the mean of its divisors is an integer number (8157766).

Almost surely, 2^16315531 is an apocalyptic number.

16315531 is a deficient number, since it is larger than the sum of its proper divisors (1).

16315531 is an equidigital number, since it uses as much as digits as its factorization.

16315531 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 16315531 is about 4039.2488163024. The cubic root of 16315531 is about 253.6298730097.

Adding to 16315531 its reverse (13551361), we get a palindrome (29866892).

The spelling of 16315531 in words is "sixteen million, three hundred fifteen thousand, five hundred thirty-one".