1255225621 has 8 divisors (see below), whose sum is σ = 1410554880. Its totient is φ = 1108292592.

The previous prime is 1255225613. The next prime is 1255225661. The reversal of 1255225621 is 1265225521.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1255225621 - 2³ = 1255225613 is a prime.

It is a super-2 number, since 2×1255225621² = 3151182719229671282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255225661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2098741 + ... + 2099338.

It is an arithmetic number, because the mean of its divisors is an integer number (176319360).

Almost surely, 2^1255225621 is an apocalyptic number.

It is an amenable number.

1255225621 is a deficient number, since it is larger than the sum of its proper divisors (155329259).

1255225621 is a wasteful number, since it uses less digits than its factorization.

1255225621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4198115.

The product of its digits is 12000, while the sum is 31.

The square root of 1255225621 is about 35429.1634250655. The cubic root of 1255225621 is about 1078.7163592989.

The spelling of 1255225621 in words is "one billion, two hundred fifty-five million, two hundred twenty-five thousand, six hundred twenty-one".