2491857377 has 2 divisors, whose sum is σ = 2491857378. Its totient is φ = 2491857376.

The previous prime is 2491857343. The next prime is 2491857437. The reversal of 2491857377 is 7737581942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2449854016 + 42003361 = 49496^2 + 6481^2 .

It is a cyclic number.

It is not a de Polignac number, because 2491857377 - 2²⁴ = 2475080161 is a prime.

It is not a weakly prime, because it can be changed into another prime (2491857307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245928688 + 1245928689.

It is an arithmetic number, because the mean of its divisors is an integer number (1245928689).

Almost surely, 2^2491857377 is an apocalyptic number.

It is an amenable number.

2491857377 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491857377 is an equidigital number, since it uses as much as digits as its factorization.

2491857377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2963520, while the sum is 53.

The square root of 2491857377 is about 49918.5073594954. The cubic root of 2491857377 is about 1355.7337070228.

The spelling of 2491857377 in words is "two billion, four hundred ninety-one million, eight hundred fifty-seven thousand, three hundred seventy-seven".