2690161 has 4 divisors (see below), whose sum is σ = 2734324. Its totient is φ = 2646000.

The previous prime is 2690147. The next prime is 2690167. The reversal of 2690161 is 1610962.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1575025 + 1115136 = 1255^2 + 1056^2 .

It is a cyclic number.

It is not a de Polignac number, because 2690161 - 2⁹ = 2689649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2690167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21990 + ... + 22111.

It is an arithmetic number, because the mean of its divisors is an integer number (683581).

2^2690161 is an apocalyptic number.

It is an amenable number.

2690161 is a deficient number, since it is larger than the sum of its proper divisors (44163).

2690161 is an equidigital number, since it uses as much as digits as its factorization.

2690161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44162.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 2690161 is about 1640.1710276675. The cubic root of 2690161 is about 139.0783161997.

It can be divided in two parts, 26901 and 61, that multiplied together give a square (1640961 = 1281²).

The spelling of 2690161 in words is "two million, six hundred ninety thousand, one hundred sixty-one".