26121631 has 2 divisors, whose sum is σ = 26121632. Its totient is φ = 26121630.

The previous prime is 26121619. The next prime is 26121659. The reversal of 26121631 is 13612162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26121631 is a prime.

It is a super-2 number, since 2×26121631² = 1364679212200322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26121611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13060815 + 13060816.

It is an arithmetic number, because the mean of its divisors is an integer number (13060816).

Almost surely, 2^26121631 is an apocalyptic number.

26121631 is a deficient number, since it is larger than the sum of its proper divisors (1).

26121631 is an equidigital number, since it uses as much as digits as its factorization.

26121631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 26121631 is about 5110.9324980868. The cubic root of 26121631 is about 296.7108516158.

Adding to 26121631 its reverse (13612162), we get a palindrome (39733793).

The spelling of 26121631 in words is "twenty-six million, one hundred twenty-one thousand, six hundred thirty-one".