2491757 has 2 divisors, whose sum is σ = 2491758. Its totient is φ = 2491756.

The previous prime is 2491729. The next prime is 2491759. The reversal of 2491757 is 7571942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2468041 + 23716 = 1571^2 + 154^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2491757 is a prime.

Together with 2491759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2491759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245878 + 1245879.

It is an arithmetic number, because the mean of its divisors is an integer number (1245879).

2^2491757 is an apocalyptic number.

It is an amenable number.

2491757 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491757 is an equidigital number, since it uses as much as digits as its factorization.

2491757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 35.

The square root of 2491757 is about 1578.5300123849. The cubic root of 2491757 is about 135.5715502890.

The spelling of 2491757 in words is "two million, four hundred ninety-one thousand, seven hundred fifty-seven".