30813977 has 2 divisors, whose sum is σ = 30813978. Its totient is φ = 30813976.

The previous prime is 30813971. The next prime is 30814033. The reversal of 30813977 is 77931803.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17774656 + 13039321 = 4216^2 + 3611^2 .

It is a cyclic number.

It is not a de Polignac number, because 30813977 - 2⁴ = 30813961 is a prime.

It is a super-3 number, since 3×30813977³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30813977.

It is not a weakly prime, because it can be changed into another prime (30813971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15406988 + 15406989.

It is an arithmetic number, because the mean of its divisors is an integer number (15406989).

Almost surely, 2^30813977 is an apocalyptic number.

It is an amenable number.

30813977 is a deficient number, since it is larger than the sum of its proper divisors (1).

30813977 is an equidigital number, since it uses as much as digits as its factorization.

30813977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 30813977 is about 5551.0338676683. The cubic root of 30813977 is about 313.5084503487.

The spelling of 30813977 in words is "thirty million, eight hundred thirteen thousand, nine hundred seventy-seven".