264220981 has 8 divisors (see below), whose sum is σ = 270506880. Its totient is φ = 257962848.

The previous prime is 264220937. The next prime is 264220991. The reversal of 264220981 is 189022462.

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 264220981 - 2¹³ = 264212789 is a prime.

It is a super-2 number, since 2×264220981² = 139625453601204722, 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 (264220991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12985 + ... + 26401.

It is an arithmetic number, because the mean of its divisors is an integer number (33813360).

Almost surely, 2^264220981 is an apocalyptic number.

It is an amenable number.

264220981 is a deficient number, since it is larger than the sum of its proper divisors (6285899).

264220981 is a wasteful number, since it uses less digits than its factorization.

264220981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13883.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 264220981 is about 16254.8756070294. The cubic root of 264220981 is about 641.6858070264.

The spelling of 264220981 in words is "two hundred sixty-four million, two hundred twenty thousand, nine hundred eighty-one".