26691031 has 4 divisors (see below), whose sum is σ = 27552064. Its totient is φ = 25830000.

The previous prime is 26691013. The next prime is 26691047. The reversal of 26691031 is 13019662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26691031 - 2⁵ = 26690999 is a prime.

It is a super-2 number, since 2×26691031² = 1424822271685922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26691001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430470 + ... + 430531.

It is an arithmetic number, because the mean of its divisors is an integer number (6888016).

Almost surely, 2^26691031 is an apocalyptic number.

26691031 is a deficient number, since it is larger than the sum of its proper divisors (861033).

26691031 is an equidigital number, since it uses as much as digits as its factorization.

26691031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861032.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 26691031 is about 5166.3363227726. The cubic root of 26691031 is about 298.8512774394.

The spelling of 26691031 in words is "twenty-six million, six hundred ninety-one thousand, thirty-one".