2391637 has 2 divisors, whose sum is σ = 2391638. Its totient is φ = 2391636.

The previous prime is 2391629. The next prime is 2391671. The reversal of 2391637 is 7361932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2390116 + 1521 = 1546^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 2391637 - 2³ = 2391629 is a prime.

2391637 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2391599 and 2391608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2391437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1195818 + 1195819.

It is an arithmetic number, because the mean of its divisors is an integer number (1195819).

2^2391637 is an apocalyptic number.

It is an amenable number.

2391637 is a deficient number, since it is larger than the sum of its proper divisors (1).

2391637 is an equidigital number, since it uses as much as digits as its factorization.

2391637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 31.

The square root of 2391637 is about 1546.4918363832. The cubic root of 2391637 is about 133.7308960399.

The spelling of 2391637 in words is "two million, three hundred ninety-one thousand, six hundred thirty-seven".