1613977649 has 2 divisors, whose sum is σ = 1613977650. Its totient is φ = 1613977648.

The previous prime is 1613977639. The next prime is 1613977657. The reversal of 1613977649 is 9467793161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1399882225 + 214095424 = 37415^2 + 14632^2 .

It is an emirp because it is prime and its reverse (9467793161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1613977649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1613977649.

It is not a weakly prime, because it can be changed into another prime (1613977619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806988824 + 806988825.

It is an arithmetic number, because the mean of its divisors is an integer number (806988825).

Almost surely, 2^1613977649 is an apocalyptic number.

It is an amenable number.

1613977649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1613977649 is an equidigital number, since it uses as much as digits as its factorization.

1613977649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 53.

The square root of 1613977649 is about 40174.3406790952. The cubic root of 1613977649 is about 1173.0031329052.

The spelling of 1613977649 in words is "one billion, six hundred thirteen million, nine hundred seventy-seven thousand, six hundred forty-nine".