2549773991 has 2 divisors, whose sum is σ = 2549773992. Its totient is φ = 2549773990.

The previous prime is 2549773981. The next prime is 2549773999. The reversal of 2549773991 is 1993779452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2549773991 - 2⁶ = 2549773927 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2549773999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1274886995 + 1274886996.

It is an arithmetic number, because the mean of its divisors is an integer number (1274886996).

Almost surely, 2^2549773991 is an apocalyptic number.

2549773991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2549773991 is an equidigital number, since it uses as much as digits as its factorization.

2549773991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4286520, while the sum is 56.

The square root of 2549773991 is about 50495.2868196627. The cubic root of 2549773991 is about 1366.1568443887.

The spelling of 2549773991 in words is "two billion, five hundred forty-nine million, seven hundred seventy-three thousand, nine hundred ninety-one".