1255251690 has 192 divisors, whose sum is σ = 4200947712. Its totient is φ = 252374400.

The previous prime is 1255251667. The next prime is 1255251707. The reversal of 1255251690 is 961525521.

1255251690 is a `hidden beast` number, since 1 + 2 + 5 + 52 + 516 + 90 = 666.

It is a super-2 number, since 2×1255251690² = 3151313610495712200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 211909 + ... + 217751.

It is an arithmetic number, because the mean of its divisors is an integer number (21879936).

Almost surely, 2^1255251690 is an apocalyptic number.

1255251690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1255251690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2100473856).

1255251690 is an abundant number, since it is smaller than the sum of its proper divisors (2945696022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1255251690 is a wasteful number, since it uses less digits than its factorization.

1255251690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5905 (or 5902 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1255251690 is about 35429.5313262820. The cubic root of 1255251690 is about 1078.7238269769.

The spelling of 1255251690 in words is "one billion, two hundred fifty-five million, two hundred fifty-one thousand, six hundred ninety".