30777661 has 2 divisors, whose sum is σ = 30777662. Its totient is φ = 30777660.

The previous prime is 30777647. The next prime is 30777707. The reversal of 30777661 is 16677703.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28955161 + 1822500 = 5381^2 + 1350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30777661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30777661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30777601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15388830 + 15388831.

It is an arithmetic number, because the mean of its divisors is an integer number (15388831).

Almost surely, 2^30777661 is an apocalyptic number.

It is an amenable number.

30777661 is a deficient number, since it is larger than the sum of its proper divisors (1).

30777661 is an equidigital number, since it uses as much as digits as its factorization.

30777661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37044, while the sum is 37.

The square root of 30777661 is about 5547.7618009428. The cubic root of 30777661 is about 313.3852395021.

The spelling of 30777661 in words is "thirty million, seven hundred seventy-seven thousand, six hundred sixty-one".