2491567 has 12 divisors (see below), whose sum is σ = 2819664. Its totient is φ = 2196480.

The previous prime is 2491553. The next prime is 2491589. The reversal of 2491567 is 7651942.

It is a de Polignac number, because none of the positive numbers 2^k-2491567 is a prime.

It is a super-2 number, since 2×2491567² = 12415812230978, which contains 22 as substring.

It is a Duffinian number.

2491567 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3567 + ... + 4207.

It is an arithmetic number, because the mean of its divisors is an integer number (234972).

2^2491567 is an apocalyptic number.

2491567 is a deficient number, since it is larger than the sum of its proper divisors (328097).

2491567 is a wasteful number, since it uses less digits than its factorization.

2491567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690 (or 677 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 2491567 is about 1578.4698286632. The cubic root of 2491567 is about 135.5681043605.

The spelling of 2491567 in words is "two million, four hundred ninety-one thousand, five hundred sixty-seven".