30990977 has 4 divisors (see below), whose sum is σ = 31037700. Its totient is φ = 30944256.

The previous prime is 30990961. The next prime is 30990997. The reversal of 30990977 is 77909903.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3857296 + 27133681 = 1964^2 + 5209^2 .

It is a cyclic number.

It is not a de Polignac number, because 30990977 - 2⁴ = 30990961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30990997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22352 + ... + 23697.

It is an arithmetic number, because the mean of its divisors is an integer number (7759425).

Almost surely, 2^30990977 is an apocalyptic number.

It is an amenable number.

30990977 is a deficient number, since it is larger than the sum of its proper divisors (46723).

30990977 is an equidigital number, since it uses as much as digits as its factorization.

30990977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46722.

The product of its (nonzero) digits is 107163, while the sum is 44.

The square root of 30990977 is about 5566.9540145397. The cubic root of 30990977 is about 314.1075841336.

The spelling of 30990977 in words is "thirty million, nine hundred ninety thousand, nine hundred seventy-seven".