1255428565 has 8 divisors (see below), whose sum is σ = 1508861088. Its totient is φ = 1002778320.

The previous prime is 1255428557. The next prime is 1255428593. The reversal of 1255428565 is 5658245521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1255428565 - 2³ = 1255428557 is a prime.

It is a super-2 number, since 2×1255428565² = 3152201763635918450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192031 + ... + 198460.

It is an arithmetic number, because the mean of its divisors is an integer number (188607636).

Almost surely, 2^1255428565 is an apocalyptic number.

It is an amenable number.

1255428565 is a deficient number, since it is larger than the sum of its proper divisors (253432523).

1255428565 is an equidigital number, since it uses as much as digits as its factorization.

1255428565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391139.

The product of its digits is 480000, while the sum is 43.

The square root of 1255428565 is about 35432.0273904839. The cubic root of 1255428565 is about 1078.7744915348.

The spelling of 1255428565 in words is "one billion, two hundred fifty-five million, four hundred twenty-eight thousand, five hundred sixty-five".