30987493 has 2 divisors, whose sum is σ = 30987494. Its totient is φ = 30987492.

The previous prime is 30987443. The next prime is 30987497. The reversal of 30987493 is 39478903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28547649 + 2439844 = 5343^2 + 1562^2 .

It is a cyclic number.

It is not a de Polignac number, because 30987493 - 2⁹ = 30986981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30987497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15493746 + 15493747.

It is an arithmetic number, because the mean of its divisors is an integer number (15493747).

Almost surely, 2^30987493 is an apocalyptic number.

It is an amenable number.

30987493 is a deficient number, since it is larger than the sum of its proper divisors (1).

30987493 is an equidigital number, since it uses as much as digits as its factorization.

30987493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 30987493 is about 5566.6410877656. The cubic root of 30987493 is about 314.0958130534.

The spelling of 30987493 in words is "thirty million, nine hundred eighty-seven thousand, four hundred ninety-three".