30881761 has 4 divisors (see below), whose sum is σ = 31018032. Its totient is φ = 30745492.

The previous prime is 30881759. The next prime is 30881777. The reversal of 30881761 is 16718803.

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 30881761 - 2¹ = 30881759 is a prime.

It is a super-2 number, since 2×30881761² = 1907366324922242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30881261) 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, 67795 + ... + 68248.

It is an arithmetic number, because the mean of its divisors is an integer number (7754508).

Almost surely, 2^30881761 is an apocalyptic number.

It is an amenable number.

30881761 is a deficient number, since it is larger than the sum of its proper divisors (136271).

30881761 is a wasteful number, since it uses less digits than its factorization.

30881761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136270.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 30881761 is about 5557.1360429631. The cubic root of 30881761 is about 313.7381652970.

The spelling of 30881761 in words is "thirty million, eight hundred eighty-one thousand, seven hundred sixty-one".