30290981 has 4 divisors (see below), whose sum is σ = 34618272. Its totient is φ = 25963692.

The previous prime is 30290969. The next prime is 30290989. The reversal of 30290981 is 18909203.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18909203 = 79 ⋅239357.

It is a cyclic number.

It is not a de Polignac number, because 30290981 - 2¹⁴ = 30274597 is a prime.

It is a super-2 number, since 2×30290981² = 1835087059884722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30290989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2163635 + ... + 2163648.

It is an arithmetic number, because the mean of its divisors is an integer number (8654568).

Almost surely, 2^30290981 is an apocalyptic number.

It is an amenable number.

30290981 is a deficient number, since it is larger than the sum of its proper divisors (4327291).

30290981 is an equidigital number, since it uses as much as digits as its factorization.

30290981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327290.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 30290981 is about 5503.7242845186. The cubic root of 30290981 is about 311.7246262167.

The spelling of 30290981 in words is "thirty million, two hundred ninety thousand, nine hundred eighty-one".