2661957 has 16 divisors (see below), whose sum is σ = 4152000. Its totient is φ = 1680912.

The previous prime is 2661949. The next prime is 2661959. The reversal of 2661957 is 7591662.

2661957 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 2661957 - 2³ = 2661949 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2082 + ... + 3107.

It is an arithmetic number, because the mean of its divisors is an integer number (259500).

2^2661957 is an apocalyptic number.

2661957 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2661957 is a deficient number, since it is larger than the sum of its proper divisors (1490043).

2661957 is a wasteful number, since it uses less digits than its factorization.

2661957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5217 (or 5211 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 2661957 is about 1631.5504895651. The cubic root of 2661957 is about 138.5905692502.

The spelling of 2661957 in words is "two million, six hundred sixty-one thousand, nine hundred fifty-seven".