156401 has 4 divisors (see below), whose sum is σ = 178752. Its totient is φ = 134052.

The previous prime is 156371. The next prime is 156419. The reversal of 156401 is 104651.

It is a happy number.

156401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 156401 - 2¹⁰ = 155377 is a prime.

It is a super-2 number, since 2×156401² = 48922545602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 156401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156421) 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, 11165 + ... + 11178.

It is an arithmetic number, because the mean of its divisors is an integer number (44688).

2¹⁵⁶⁴⁰¹ is an apocalyptic number.

It is an amenable number.

156401 is a deficient number, since it is larger than the sum of its proper divisors (22351).

156401 is an equidigital number, since it uses as much as digits as its factorization.

156401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22350.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 156401 is about 395.4756629680. The cubic root of 156401 is about 53.8782120454.

The spelling of 156401 in words is "one hundred fifty-six thousand, four hundred one".