1230085581 has 4 divisors (see below), whose sum is σ = 1640114112. Its totient is φ = 820057052.

The previous prime is 1230085573. The next prime is 1230085583. The reversal of 1230085581 is 1855800321.

It is a happy number.

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 1230085581 - 2³ = 1230085573 is a prime.

It is a super-2 number, since 2×1230085581² = 3026221073168215122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230085583) 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, 205014261 + ... + 205014266.

It is an arithmetic number, because the mean of its divisors is an integer number (410028528).

Almost surely, 2^1230085581 is an apocalyptic number.

It is an amenable number.

1230085581 is a deficient number, since it is larger than the sum of its proper divisors (410028531).

1230085581 is an equidigital number, since it uses as much as digits as its factorization.

1230085581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410028530.

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 1230085581 is about 35072.5759105316. The cubic root of 1230085581 is about 1071.4661187121.

The spelling of 1230085581 in words is "one billion, two hundred thirty million, eighty-five thousand, five hundred eighty-one".