156438091 has 4 divisors (see below), whose sum is σ = 158418400. Its totient is φ = 154457784.

The previous prime is 156438071. The next prime is 156438101. The reversal of 156438091 is 190834651.

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 156438091 - 2¹¹ = 156436043 is a prime.

It is a super-3 number, since 3×156438091³ (a number of 26 digits) contains 333 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 156438091.

It is not an unprimeable number, because it can be changed into a prime (156438071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 990036 + ... + 990193.

It is an arithmetic number, because the mean of its divisors is an integer number (39604600).

Almost surely, 2^156438091 is an apocalyptic number.

156438091 is a deficient number, since it is larger than the sum of its proper divisors (1980309).

156438091 is an equidigital number, since it uses as much as digits as its factorization.

156438091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980308.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 156438091 is about 12507.5213771554. The cubic root of 156438091 is about 538.8247083912.

The spelling of 156438091 in words is "one hundred fifty-six million, four hundred thirty-eight thousand, ninety-one".