30506731 has 2 divisors, whose sum is σ = 30506732. Its totient is φ = 30506730.

The previous prime is 30506701. The next prime is 30506803. The reversal of 30506731 is 13760503.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30506731 - 2⁵ = 30506699 is a prime.

It is a super-2 number, since 2×30506731² = 1861321272612722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30506696 and 30506705.

It is not a weakly prime, because it can be changed into another prime (30506701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15253365 + 15253366.

It is an arithmetic number, because the mean of its divisors is an integer number (15253366).

Almost surely, 2^30506731 is an apocalyptic number.

30506731 is a deficient number, since it is larger than the sum of its proper divisors (1).

30506731 is an equidigital number, since it uses as much as digits as its factorization.

30506731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 25.

The square root of 30506731 is about 5523.2898710823. The cubic root of 30506731 is about 312.4629707591.

The spelling of 30506731 in words is "thirty million, five hundred six thousand, seven hundred thirty-one".