26351981 has 8 divisors (see below), whose sum is σ = 27319680. Its totient is φ = 25388272.

The previous prime is 26351977. The next prime is 26351987. The reversal of 26351981 is 18915362.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26351981 - 2² = 26351977 is a prime.

It is a super-2 number, since 2×26351981² = 1388853805248722, 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 (26351987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20936 + ... + 22158.

It is an arithmetic number, because the mean of its divisors is an integer number (3414960).

Almost surely, 2^26351981 is an apocalyptic number.

It is an amenable number.

26351981 is a deficient number, since it is larger than the sum of its proper divisors (967699).

26351981 is a wasteful number, since it uses less digits than its factorization.

26351981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995.

The product of its digits is 12960, while the sum is 35.

The square root of 26351981 is about 5133.4180620713. The cubic root of 26351981 is about 297.5804683112.

The spelling of 26351981 in words is "twenty-six million, three hundred fifty-one thousand, nine hundred eighty-one".