156140217 has 20 divisors (see below), whose sum is σ = 236736016. Its totient is φ = 102536280.

The previous prime is 156140213. The next prime is 156140219. The reversal of 156140217 is 712041651.

It is a happy number.

It is not a de Polignac number, because 156140217 - 2² = 156140213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156140213) 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 19 ways as a sum of consecutive naturals, for example, 8959 + ... + 19812.

Almost surely, 2^156140217 is an apocalyptic number.

It is an amenable number.

156140217 is a deficient number, since it is larger than the sum of its proper divisors (80595799).

156140217 is an equidigital number, since it uses as much as digits as its factorization.

156140217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28850 (or 28841 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 156140217 is about 12495.6079083812. The cubic root of 156140217 is about 538.4824987911.

Adding to 156140217 its reverse (712041651), we get a palindrome (868181868).

The spelling of 156140217 in words is "one hundred fifty-six million, one hundred forty thousand, two hundred seventeen".