30765131 has 4 divisors (see below), whose sum is σ = 30989832. Its totient is φ = 30540432.

The previous prime is 30765107. The next prime is 30765139. The reversal of 30765131 is 13156703.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30765131 is a prime.

It is a super-2 number, since 2×30765131² = 1892986570894322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30765131.

It is not an unprimeable number, because it can be changed into a prime (30765139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112145 + ... + 112418.

It is an arithmetic number, because the mean of its divisors is an integer number (7747458).

Almost surely, 2^30765131 is an apocalyptic number.

30765131 is a deficient number, since it is larger than the sum of its proper divisors (224701).

30765131 is a wasteful number, since it uses less digits than its factorization.

30765131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224700.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 30765131 is about 5546.6324017371. The cubic root of 30765131 is about 313.3427059467.

The spelling of 30765131 in words is "thirty million, seven hundred sixty-five thousand, one hundred thirty-one".