1256201995 has 16 divisors (see below), whose sum is σ = 1647606528. Its totient is φ = 915333120.

The previous prime is 1256201987. The next prime is 1256202007. The reversal of 1256201995 is 5991026521.

It is not a de Polignac number, because 1256201995 - 2³ = 1256201987 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235734 + ... + 241003.

It is an arithmetic number, because the mean of its divisors is an integer number (102975408).

Almost surely, 2^1256201995 is an apocalyptic number.

1256201995 is a deficient number, since it is larger than the sum of its proper divisors (391404533).

1256201995 is a wasteful number, since it uses less digits than its factorization.

1256201995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476790.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 1256201995 is about 35442.9399880992. The cubic root of 1256201995 is about 1078.9959790535.

The spelling of 1256201995 in words is "one billion, two hundred fifty-six million, two hundred one thousand, nine hundred ninety-five".