981255579 has 4 divisors (see below), whose sum is σ = 1308340776. Its totient is φ = 654170384.

The previous prime is 981255563. The next prime is 981255641. The reversal of 981255579 is 975552189.

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 981255579 - 2⁴ = 981255563 is a prime.

It is a super-2 number, since 2×981255579² = 1925725022637250482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (981255179) 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, 163542594 + ... + 163542599.

It is an arithmetic number, because the mean of its divisors is an integer number (327085194).

Almost surely, 2^981255579 is an apocalyptic number.

981255579 is a deficient number, since it is larger than the sum of its proper divisors (327085197).

981255579 is a wasteful number, since it uses less digits than its factorization.

981255579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327085196.

The product of its digits is 1134000, while the sum is 51.

The square root of 981255579 is about 31324.9992657622. Note that the first 3 decimals coincide. The cubic root of 981255579 is about 993.7124087200.

The spelling of 981255579 in words is "nine hundred eighty-one million, two hundred fifty-five thousand, five hundred seventy-nine".