2635861 has 2 divisors, whose sum is σ = 2635862. Its totient is φ = 2635860.

The previous prime is 2635819. The next prime is 2635877. The reversal of 2635861 is 1685362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2480625 + 155236 = 1575^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 2635861 - 2⁹ = 2635349 is a prime.

It is a super-2 number, since 2×2635861² = 13895526422642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2635891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1317930 + 1317931.

It is an arithmetic number, because the mean of its divisors is an integer number (1317931).

2^2635861 is an apocalyptic number.

It is an amenable number.

2635861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2635861 is an equidigital number, since it uses as much as digits as its factorization.

2635861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 2635861 is about 1623.5334921091. The cubic root of 2635861 is about 138.1361989377.

The spelling of 2635861 in words is "two million, six hundred thirty-five thousand, eight hundred sixty-one".