326477981 has 4 divisors (see below), whose sum is σ = 326711100. Its totient is φ = 326244864.

The previous prime is 326477971. The next prime is 326477993. The reversal of 326477981 is 189774623.

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

It can be written as a sum of positive squares in 2 ways, for example, as 128822500 + 197655481 = 11350^2 + 14059^2 .

It is a cyclic number.

It is not a de Polignac number, because 326477981 - 2¹⁸ = 326215837 is a prime.

It is a super-2 number, since 2×326477981² = 213175744155672722, 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 (326477971) 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, 114446 + ... + 117263.

It is an arithmetic number, because the mean of its divisors is an integer number (81677775).

Almost surely, 2^326477981 is an apocalyptic number.

It is an amenable number.

326477981 is a deficient number, since it is larger than the sum of its proper divisors (233119).

326477981 is a wasteful number, since it uses less digits than its factorization.

326477981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233118.

The product of its digits is 508032, while the sum is 47.

The square root of 326477981 is about 18068.7016965802. The cubic root of 326477981 is about 688.5750759276.

The spelling of 326477981 in words is "three hundred twenty-six million, four hundred seventy-seven thousand, nine hundred eighty-one".