1167220581 has 4 divisors (see below), whose sum is σ = 1556294112. Its totient is φ = 778147052.

The previous prime is 1167220567. The next prime is 1167220589. The reversal of 1167220581 is 1850227611.

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 not a de Polignac number, because 1167220581 - 2⁶ = 1167220517 is a prime.

It is a super-2 number, since 2×1167220581² = 2724807769419955122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1167220589) 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, 194536761 + ... + 194536766.

It is an arithmetic number, because the mean of its divisors is an integer number (389073528).

Almost surely, 2^1167220581 is an apocalyptic number.

It is an amenable number.

1167220581 is a deficient number, since it is larger than the sum of its proper divisors (389073531).

1167220581 is an equidigital number, since it uses as much as digits as its factorization.

1167220581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389073530.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 1167220581 is about 34164.6100665586. The cubic root of 1167220581 is about 1052.8931790641.

The spelling of 1167220581 in words is "one billion, one hundred sixty-seven million, two hundred twenty thousand, five hundred eighty-one".