30493531 has 2 divisors, whose sum is σ = 30493532. Its totient is φ = 30493530.

The previous prime is 30493523. The next prime is 30493549. The reversal of 30493531 is 13539403.

It is a weak prime.

It is an emirp because it is prime and its reverse (13539403) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30493531 - 2³ = 30493523 is a prime.

It is a super-2 number, since 2×30493531² = 1859710865695922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30493531.

It is not a weakly prime, because it can be changed into another prime (30493511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15246765 + 15246766.

It is an arithmetic number, because the mean of its divisors is an integer number (15246766).

Almost surely, 2^30493531 is an apocalyptic number.

30493531 is a deficient number, since it is larger than the sum of its proper divisors (1).

30493531 is an equidigital number, since it uses as much as digits as its factorization.

30493531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 30493531 is about 5522.0948017940. The cubic root of 30493531 is about 312.4178975780.

The spelling of 30493531 in words is "thirty million, four hundred ninety-three thousand, five hundred thirty-one".