2567991 has 4 divisors (see below), whose sum is σ = 3423992. Its totient is φ = 1711992.

The previous prime is 2567987. The next prime is 2568001. The reversal of 2567991 is 1997652.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2567991 - 2² = 2567987 is a prime.

It is a super-3 number, since 3×2567991³ = 50804449133328069813, which contains 333 as substring.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2567941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427996 + ... + 428001.

It is an arithmetic number, because the mean of its divisors is an integer number (855998).

2^2567991 is an apocalyptic number.

2567991 is a deficient number, since it is larger than the sum of its proper divisors (856001).

2567991 is an equidigital number, since it uses as much as digits as its factorization.

2567991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856000.

The product of its digits is 34020, while the sum is 39.

The square root of 2567991 is about 1602.4952418026. The cubic root of 2567991 is about 136.9402655741.

The spelling of 2567991 in words is "two million, five hundred sixty-seven thousand, nine hundred ninety-one".