1256465001 has 16 divisors (see below), whose sum is σ = 1829744640. Its totient is φ = 760594320.

The previous prime is 1256464897. The next prime is 1256465009. The reversal of 1256465001 is 1005646521.

It is not a de Polignac number, because 1256465001 - 2¹⁴ = 1256448617 is a prime.

It is a super-3 number, since 3×1256465001³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1256465001.

It is not an unprimeable number, because it can be changed into a prime (1256465009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6420 + ... + 50538.

It is an arithmetic number, because the mean of its divisors is an integer number (114359040).

Almost surely, 2^1256465001 is an apocalyptic number.

1256465001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1256465001 is a deficient number, since it is larger than the sum of its proper divisors (573279639).

1256465001 is a wasteful number, since it uses less digits than its factorization.

1256465001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44996.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1256465001 is about 35446.6500673900. The cubic root of 1256465001 is about 1079.0712754934.

The spelling of 1256465001 in words is "one billion, two hundred fifty-six million, four hundred sixty-five thousand, one".