2257991 has 8 divisors (see below), whose sum is σ = 2404080. Its totient is φ = 2113408.

The previous prime is 2257987. The next prime is 2258023. The reversal of 2257991 is 1997522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2257991 - 2² = 2257987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2257961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5180 + ... + 5598.

It is an arithmetic number, because the mean of its divisors is an integer number (300510).

2^2257991 is an apocalyptic number.

2257991 is a deficient number, since it is larger than the sum of its proper divisors (146089).

2257991 is a wasteful number, since it uses less digits than its factorization.

2257991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753.

The product of its digits is 11340, while the sum is 35.

The square root of 2257991 is about 1502.6613058171. The cubic root of 2257991 is about 131.1920149004.

The spelling of 2257991 in words is "two million, two hundred fifty-seven thousand, nine hundred ninety-one".