1156401 has 6 divisors (see below), whose sum is σ = 1670370. Its totient is φ = 770928.

The previous prime is 1156387. The next prime is 1156403. The reversal of 1156401 is 1046511.

It can be written as a sum of positive squares in only one way, i.e., 720801 + 435600 = 849^2 + 660^2 .

It is not a de Polignac number, because 1156401 - 2⁵ = 1156369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1156403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64236 + ... + 64253.

It is an arithmetic number, because the mean of its divisors is an integer number (278395).

2^1156401 is an apocalyptic number.

It is an amenable number.

1156401 is a deficient number, since it is larger than the sum of its proper divisors (513969).

1156401 is a wasteful number, since it uses less digits than its factorization.

1156401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128495 (or 128492 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1156401 is about 1075.3608696619. The cubic root of 1156401 is about 104.9629801467.

The spelling of 1156401 in words is "one million, one hundred fifty-six thousand, four hundred one".