30991077 has 12 divisors (see below), whose sum is σ = 48208524. Its totient is φ = 19071360.

The previous prime is 30991067. The next prime is 30991091. The reversal of 30991077 is 77019903.

It can be written as a sum of positive squares in 2 ways, for example, as 10929636 + 20061441 = 3306^2 + 4479^2 .

It is not a de Polignac number, because 30991077 - 2⁶ = 30991013 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30991007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132324 + ... + 132557.

It is an arithmetic number, because the mean of its divisors is an integer number (4017377).

Almost surely, 2^30991077 is an apocalyptic number.

It is an amenable number.

30991077 is a deficient number, since it is larger than the sum of its proper divisors (17217447).

30991077 is a wasteful number, since it uses less digits than its factorization.

30991077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264900 (or 264897 counting only the distinct ones).

The product of its (nonzero) digits is 11907, while the sum is 36.

The square root of 30991077 is about 5566.9629961048. The cubic root of 30991077 is about 314.1079219817.

The spelling of 30991077 in words is "thirty million, nine hundred ninety-one thousand, seventy-seven".