30516139 has 4 divisors (see below), whose sum is σ = 32311224. Its totient is φ = 28721056.

The previous prime is 30516133. The next prime is 30516151. The reversal of 30516139 is 93161503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93161503 = 19 ⋅4903237.

It is a cyclic number.

It is not a de Polignac number, because 30516139 - 2³ = 30516131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30516131) 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, 897517 + ... + 897550.

It is an arithmetic number, because the mean of its divisors is an integer number (8077806).

Almost surely, 2^30516139 is an apocalyptic number.

30516139 is a deficient number, since it is larger than the sum of its proper divisors (1795085).

30516139 is a wasteful number, since it uses less digits than its factorization.

30516139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795084.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 30516139 is about 5524.1414717583. The cubic root of 30516139 is about 312.4950877094.

The spelling of 30516139 in words is "thirty million, five hundred sixteen thousand, one hundred thirty-nine".