1256262155 has 8 divisors (see below), whose sum is σ = 1510951200. Its totient is φ = 1002718656.

The previous prime is 1256262151. The next prime is 1256262191. The reversal of 1256262155 is 5512626521.

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 1256262155 - 2² = 1256262151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256262151) 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, 283970 + ... + 288359.

It is an arithmetic number, because the mean of its divisors is an integer number (188868900).

Almost surely, 2^1256262155 is an apocalyptic number.

1256262155 is a deficient number, since it is larger than the sum of its proper divisors (254689045).

1256262155 is an equidigital number, since it uses as much as digits as its factorization.

1256262155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572773.

The product of its digits is 36000, while the sum is 35.

The square root of 1256262155 is about 35443.7886659990. The cubic root of 1256262155 is about 1079.0132032903.

Adding to 1256262155 its reverse (5512626521), we get a palindrome (6768888676).

The spelling of 1256262155 in words is "one billion, two hundred fifty-six million, two hundred sixty-two thousand, one hundred fifty-five".