30761 has 4 divisors (see below), whose sum is σ = 32400. Its totient is φ = 29124.

The previous prime is 30757. The next prime is 30763. The reversal of 30761 is 16703.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30761 - 2² = 30757 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 791 + ... + 828.

It is an arithmetic number, because the mean of its divisors is an integer number (8100).

2³⁰⁷⁶¹ is an apocalyptic number.

It is an amenable number.

30761 is a deficient number, since it is larger than the sum of its proper divisors (1639).

30761 is a wasteful number, since it uses less digits than its factorization.

30761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 30761 is about 175.3881409902. The cubic root of 30761 is about 31.3328680581.

The spelling of 30761 in words is "thirty thousand, seven hundred sixty-one".