2051555 has 12 divisors (see below), whose sum is σ = 2706816. Its totient is φ = 1491600.

The previous prime is 2051537. The next prime is 2051587. The reversal of 2051555 is 5551502.

It is not a de Polignac number, because 2051555 - 2²⁰ = 1002979 is a prime.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2051555.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1091 + ... + 2300.

It is an arithmetic number, because the mean of its divisors is an integer number (225568).

2^2051555 is an apocalyptic number.

2051555 is a deficient number, since it is larger than the sum of its proper divisors (655261).

2051555 is a wasteful number, since it uses less digits than its factorization.

2051555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418 (or 3407 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 23.

The square root of 2051555 is about 1432.3250329447. The cubic root of 2051555 is about 127.0655209888.

The spelling of 2051555 in words is "two million, fifty-one thousand, five hundred fifty-five".