1255781089 has 4 divisors (see below), whose sum is σ = 1264209300. Its totient is φ = 1247352880.

The previous prime is 1255781029. The next prime is 1255781141. The reversal of 1255781089 is 9801875521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 467294689 + 788486400 = 21617^2 + 28080^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255781089 - 2⁹ = 1255780577 is a prime.

It is a super-2 number, since 2×1255781089² = 3153972286980051842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255781029) 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, 4213882 + ... + 4214179.

It is an arithmetic number, because the mean of its divisors is an integer number (316052325).

Almost surely, 2^1255781089 is an apocalyptic number.

It is an amenable number.

1255781089 is a deficient number, since it is larger than the sum of its proper divisors (8428211).

1255781089 is an equidigital number, since it uses as much as digits as its factorization.

1255781089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8428210.

The product of its (nonzero) digits is 201600, while the sum is 46.

The square root of 1255781089 is about 35437.0016931455. The cubic root of 1255781089 is about 1078.8754552799.

The spelling of 1255781089 in words is "one billion, two hundred fifty-five million, seven hundred eighty-one thousand, eighty-nine".