2991957 has 4 divisors (see below), whose sum is σ = 3989280. Its totient is φ = 1994636.

The previous prime is 2991929. The next prime is 2991971. The reversal of 2991957 is 7591992.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2991957 - 2⁸ = 2991701 is a prime.

It is a D-number.

2991957 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498657 + ... + 498662.

It is an arithmetic number, because the mean of its divisors is an integer number (997320).

2^2991957 is an apocalyptic number.

It is an amenable number.

2991957 is a deficient number, since it is larger than the sum of its proper divisors (997323).

2991957 is an equidigital number, since it uses as much as digits as its factorization.

2991957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997322.

The product of its digits is 51030, while the sum is 42.

The square root of 2991957 is about 1729.7274351758. The cubic root of 2991957 is about 144.0959526384.

The spelling of 2991957 in words is "two million, nine hundred ninety-one thousand, nine hundred fifty-seven".