2551690 has 16 divisors (see below), whose sum is σ = 4637160. Its totient is φ = 1010880.

The previous prime is 2551687. The next prime is 2551697. The reversal of 2551690 is 961552.

It can be written as a sum of positive squares in 4 ways, for example, as 2350089 + 201601 = 1533^2 + 449^2 .

It is a super-2 number, since 2×2551690² = 13022243712200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2551697) 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 7 ways as a sum of consecutive naturals, for example, 81 + ... + 2260.

2^2551690 is an apocalyptic number.

2551690 is a deficient number, since it is larger than the sum of its proper divisors (2085470).

2551690 is a wasteful number, since it uses less digits than its factorization.

2551690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 2551690 is about 1597.4010141477. The cubic root of 2551690 is about 136.6498954897.

It can be divided in two parts, 25 and 51690, that added together give a palindrome (51715).

The spelling of 2551690 in words is "two million, five hundred fifty-one thousand, six hundred ninety".