2779631 has 2 divisors, whose sum is σ = 2779632. Its totient is φ = 2779630.

The previous prime is 2779613. The next prime is 2779633. The reversal of 2779631 is 1369772.

Together with previous prime (2779613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2779631 is a prime.

It is a super-2 number, since 2×2779631² = 15452696992322, which contains 22 as substring.

Together with 2779633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2779591 and 2779600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2779633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389815 + 1389816.

It is an arithmetic number, because the mean of its divisors is an integer number (1389816).

2^2779631 is an apocalyptic number.

2779631 is a deficient number, since it is larger than the sum of its proper divisors (1).

2779631 is an equidigital number, since it uses as much as digits as its factorization.

2779631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 35.

The square root of 2779631 is about 1667.2225406346. Note that the first 3 decimals coincide. The cubic root of 2779631 is about 140.6033652973.

The spelling of 2779631 in words is "two million, seven hundred seventy-nine thousand, six hundred thirty-one".