1256465089 has 12 divisors (see below), whose sum is σ = 1382008320. Its totient is φ = 1141467800.

The previous prime is 1256465057. The next prime is 1256465099. The reversal of 1256465089 is 9805646521.

It is not a de Polignac number, because 1256465089 - 2⁵ = 1256465057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256465009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 252972 + ... + 257890.

It is an arithmetic number, because the mean of its divisors is an integer number (115167360).

Almost surely, 2^1256465089 is an apocalyptic number.

It is an amenable number.

1256465089 is a deficient number, since it is larger than the sum of its proper divisors (125543231).

1256465089 is a wasteful number, since it uses less digits than its factorization.

1256465089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7052 (or 7041 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 46.

The square root of 1256465089 is about 35446.6513086921. The cubic root of 1256465089 is about 1079.0713006853.

The spelling of 1256465089 in words is "one billion, two hundred fifty-six million, four hundred sixty-five thousand, eighty-nine".