30520631 has 4 divisors (see below), whose sum is σ = 32127000. Its totient is φ = 28914264.

The previous prime is 30520613. The next prime is 30520649. The reversal of 30520631 is 13602503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13602503 = 53 ⋅256651.

It is an interprime number because it is at equal distance from previous prime (30520613) and next prime (30520649).

It is a cyclic number.

It is not a de Polignac number, because 30520631 - 2¹⁴ = 30504247 is a prime.

It is a super-2 number, since 2×30520631² = 1863017833276322, 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 (30520601) 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, 803156 + ... + 803193.

It is an arithmetic number, because the mean of its divisors is an integer number (8031750).

Almost surely, 2^30520631 is an apocalyptic number.

30520631 is a deficient number, since it is larger than the sum of its proper divisors (1606369).

30520631 is a wasteful number, since it uses less digits than its factorization.

30520631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606368.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 30520631 is about 5524.5480358125. The cubic root of 30520631 is about 312.5104201325.

The spelling of 30520631 in words is "thirty million, five hundred twenty thousand, six hundred thirty-one".