1258961265 has 32 divisors (see below), whose sum is σ = 2369813760. Its totient is φ = 631948032.

The previous prime is 1258961233. The next prime is 1258961269. The reversal of 1258961265 is 5621698521.

1258961265 is a `hidden beast` number, since 1 + 2 + 589 + 6 + 1 + 2 + 65 = 666.

It is not a de Polignac number, because 1258961265 - 2⁵ = 1258961233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1258961265.

It is not an unprimeable number, because it can be changed into a prime (1258961269) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 271989 + ... + 276578.

It is an arithmetic number, because the mean of its divisors is an integer number (74056680).

Almost surely, 2^1258961265 is an apocalyptic number.

1258961265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1258961265 is a deficient number, since it is larger than the sum of its proper divisors (1110852495).

1258961265 is a wasteful number, since it uses less digits than its factorization.

1258961265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548598 (or 548592 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 1258961265 is about 35481.8441600771. The cubic root of 1258961265 is about 1079.7854126129.

The spelling of 1258961265 in words is "one billion, two hundred fifty-eight million, nine hundred sixty-one thousand, two hundred sixty-five".