1255206417 has 4 divisors (see below), whose sum is σ = 1673608560. Its totient is φ = 836804276.

The previous prime is 1255206409. The next prime is 1255206451. The reversal of 1255206417 is 7146025521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7146025521 = 3 ⋅2382008507.

It is a cyclic number.

It is not a de Polignac number, because 1255206417 - 2³ = 1255206409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255206497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209201067 + ... + 209201072.

It is an arithmetic number, because the mean of its divisors is an integer number (418402140).

Almost surely, 2^1255206417 is an apocalyptic number.

It is an amenable number.

1255206417 is a deficient number, since it is larger than the sum of its proper divisors (418402143).

1255206417 is an equidigital number, since it uses as much as digits as its factorization.

1255206417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418402142.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 1255206417 is about 35428.8924043640. The cubic root of 1255206417 is about 1078.7108580901.

The spelling of 1255206417 in words is "one billion, two hundred fifty-five million, two hundred six thousand, four hundred seventeen".