1271901 has 8 divisors (see below), whose sum is σ = 1702624. Its totient is φ = 844560.

The previous prime is 1271849. The next prime is 1271903. The reversal of 1271901 is 1091721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1271901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (212828).

2^1271901 is an apocalyptic number.

1271901 is the 921-st pentagonal number.

It is an amenable number.

1271901 is a deficient number, since it is larger than the sum of its proper divisors (430723).

1271901 is a wasteful number, since it uses less digits than its factorization.

1271901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 1271901 is about 1127.7858839336. The cubic root of 1271901 is about 108.3472192588.

The spelling of 1271901 in words is "one million, two hundred seventy-one thousand, nine hundred one".