2491123 has 2 divisors, whose sum is σ = 2491124. Its totient is φ = 2491122.

The previous prime is 2491117. The next prime is 2491171. The reversal of 2491123 is 3211942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2491123 - 2⁵ = 2491091 is a prime.

It is a super-2 number, since 2×2491123² = 12411387602258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2491094 and 2491103.

It is not a weakly prime, because it can be changed into another prime (2491523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245561 + 1245562.

It is an arithmetic number, because the mean of its divisors is an integer number (1245562).

2^2491123 is an apocalyptic number.

2491123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491123 is an equidigital number, since it uses as much as digits as its factorization.

2491123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 2491123 is about 1578.3291798608. The cubic root of 2491123 is about 135.5600510866.

The spelling of 2491123 in words is "two million, four hundred ninety-one thousand, one hundred twenty-three".