30979919 has 4 divisors (see below), whose sum is σ = 32326896. Its totient is φ = 29632944.

The previous prime is 30979901. The next prime is 30979939. The reversal of 30979919 is 91997903.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91997903 = 5623 ⋅16361.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30979919 is a prime.

It is a super-2 number, since 2×30979919² = 1919510762493122, 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 (30979939) 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, 673454 + ... + 673499.

It is an arithmetic number, because the mean of its divisors is an integer number (8081724).

Almost surely, 2^30979919 is an apocalyptic number.

30979919 is a deficient number, since it is larger than the sum of its proper divisors (1346977).

30979919 is a wasteful number, since it uses less digits than its factorization.

30979919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346976.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 30979919 is about 5565.9607436632. The cubic root of 30979919 is about 314.0702204104.

The spelling of 30979919 in words is "thirty million, nine hundred seventy-nine thousand, nine hundred nineteen".