264341981 has 4 divisors (see below), whose sum is σ = 266908512. Its totient is φ = 261775452.

The previous prime is 264341971. The next prime is 264341983. The reversal of 264341981 is 189143462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264341981 is a prime.

It is a super-2 number, since 2×264341981² = 139753365838008722, 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 (264341983) 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, 1283111 + ... + 1283316.

It is an arithmetic number, because the mean of its divisors is an integer number (66727128).

Almost surely, 2^264341981 is an apocalyptic number.

It is an amenable number.

264341981 is a deficient number, since it is larger than the sum of its proper divisors (2566531).

264341981 is a wasteful number, since it uses less digits than its factorization.

264341981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566530.

The product of its digits is 41472, while the sum is 38.

The square root of 264341981 is about 16258.5971412050. The cubic root of 264341981 is about 641.7837454174.

The spelling of 264341981 in words is "two hundred sixty-four million, three hundred forty-one thousand, nine hundred eighty-one".