1285258957 has 4 divisors (see below), whose sum is σ = 1309509180. Its totient is φ = 1261008736.

The previous prime is 1285258943. The next prime is 1285258967. The reversal of 1285258957 is 7598525821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7598525821 = 317 ⋅23970113.

It can be written as a sum of positive squares in 2 ways, for example, as 354154761 + 931104196 = 18819^2 + 30514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285258957 - 2⁷ = 1285258829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285258967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12125032 + ... + 12125137.

It is an arithmetic number, because the mean of its divisors is an integer number (327377295).

Almost surely, 2^1285258957 is an apocalyptic number.

It is an amenable number.

1285258957 is a deficient number, since it is larger than the sum of its proper divisors (24250223).

1285258957 is an equidigital number, since it uses as much as digits as its factorization.

1285258957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24250222.

The product of its digits is 2016000, while the sum is 52.

The square root of 1285258957 is about 35850.5084622241. The cubic root of 1285258957 is about 1087.2519945672.

The spelling of 1285258957 in words is "one billion, two hundred eighty-five million, two hundred fifty-eight thousand, nine hundred fifty-seven".