2639961 has 6 divisors (see below), whose sum is σ = 3813290. Its totient is φ = 1759968.

The previous prime is 2639953. The next prime is 2639969. The reversal of 2639961 is 1699362.

It is an interprime number because it is at equal distance from previous prime (2639953) and next prime (2639969).

It can be written as a sum of positive squares in only one way, i.e., 1550025 + 1089936 = 1245^2 + 1044^2 .

It is not a de Polignac number, because 2639961 - 2³ = 2639953 is a prime.

It is a Duffinian number.

2639961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2639969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 146656 + ... + 146673.

2^2639961 is an apocalyptic number.

It is an amenable number.

2639961 is a deficient number, since it is larger than the sum of its proper divisors (1173329).

2639961 is a wasteful number, since it uses less digits than its factorization.

2639961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293335 (or 293332 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 2639961 is about 1624.7956794625. The cubic root of 2639961 is about 138.2077840249.

It can be divided in two parts, 2639 and 961, that added together give a square (3600 = 60²).

The spelling of 2639961 in words is "two million, six hundred thirty-nine thousand, nine hundred sixty-one".