2497991 has 2 divisors, whose sum is σ = 2497992. Its totient is φ = 2497990.

The previous prime is 2497967. The next prime is 2498009. The reversal of 2497991 is 1997942.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2497991 - 2⁶ = 2497927 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 (2497931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1248995 + 1248996.

It is an arithmetic number, because the mean of its divisors is an integer number (1248996).

2^2497991 is an apocalyptic number.

2497991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2497991 is an equidigital number, since it uses as much as digits as its factorization.

2497991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 2497991 is about 1580.5034008189. The cubic root of 2497991 is about 135.6845159871.

The spelling of 2497991 in words is "two million, four hundred ninety-seven thousand, nine hundred ninety-one".