30251992761 has 9 divisors (see below), whose sum is σ = 43698076591. Its totient is φ = 20167647312.

The previous prime is 30251992741. The next prime is 30251992769. The reversal of 30251992761 is 16729915203.

It is a happy number.

The square root of 30251992761 is 173931.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8685308025 + 21566684736 = 93195^2 + 146856^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 30251992761 - 2⁹ = 30251992249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30251992769) 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 in 8 ways as a sum of consecutive naturals, for example, 492805 + ... + 550781.

Almost surely, 2^30251992761 is an apocalyptic number.

30251992761 is the 173931-st square number.

30251992761 is the 86966-th centered octagonal number.

It is an amenable number.

30251992761 is a deficient number, since it is larger than the sum of its proper divisors (13446083830).

30251992761 is an frugal number, since it uses more digits than its factorization.

30251992761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115960 (or 57980 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 30251992761 in words is "thirty billion, two hundred fifty-one million, nine hundred ninety-two thousand, seven hundred sixty-one".