156147121 has 4 divisors (see below), whose sum is σ = 168158452. Its totient is φ = 144135792.

The previous prime is 156147119. The next prime is 156147139. The reversal of 156147121 is 121741651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121741651 = 1427 ⋅85313.

It can be written as a sum of positive squares in 2 ways, for example, as 8767521 + 147379600 = 2961^2 + 12140^2 .

It is a cyclic number.

It is not a de Polignac number, because 156147121 - 2¹ = 156147119 is a prime.

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 156147121.

It is not an unprimeable number, because it can be changed into a prime (156147151) 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, 6005646 + ... + 6005671.

It is an arithmetic number, because the mean of its divisors is an integer number (42039613).

Almost surely, 2^156147121 is an apocalyptic number.

It is an amenable number.

156147121 is a deficient number, since it is larger than the sum of its proper divisors (12011331).

156147121 is a wasteful number, since it uses less digits than its factorization.

156147121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12011330.

The product of its digits is 1680, while the sum is 28.

The square root of 156147121 is about 12495.8841623952. The cubic root of 156147121 is about 538.4904353079.

Adding to 156147121 its reverse (121741651), we get a palindrome (277888772).

The spelling of 156147121 in words is "one hundred fifty-six million, one hundred forty-seven thousand, one hundred twenty-one".