1256006051 has 4 divisors (see below), whose sum is σ = 1282729632. Its totient is φ = 1229282472.

The previous prime is 1256006047. The next prime is 1256006083. The reversal of 1256006051 is 1506006521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1256006051 - 2² = 1256006047 is a prime.

It is a super-2 number, since 2×1256006051² = 3155102400297229202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1256006051.

It is not an unprimeable number, because it can be changed into a prime (1256006351) 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, 13361720 + ... + 13361813.

It is an arithmetic number, because the mean of its divisors is an integer number (320682408).

Almost surely, 2^1256006051 is an apocalyptic number.

1256006051 is a deficient number, since it is larger than the sum of its proper divisors (26723581).

1256006051 is an equidigital number, since it uses as much as digits as its factorization.

1256006051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26723580.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1256006051 is about 35440.1756626572. The cubic root of 1256006051 is about 1078.9398750770.

The spelling of 1256006051 in words is "one billion, two hundred fifty-six million, six thousand, fifty-one".