156016121 has 2 divisors, whose sum is σ = 156016122. Its totient is φ = 156016120.

The previous prime is 156016117. The next prime is 156016127. The reversal of 156016121 is 121610651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155276521 + 739600 = 12461^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 156016121 - 2² = 156016117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (156016127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78008060 + 78008061.

It is an arithmetic number, because the mean of its divisors is an integer number (78008061).

Almost surely, 2^156016121 is an apocalyptic number.

It is an amenable number.

156016121 is a deficient number, since it is larger than the sum of its proper divisors (1).

156016121 is an equidigital number, since it uses as much as digits as its factorization.

156016121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 156016121 is about 12490.6413366168. The cubic root of 156016121 is about 538.3398038970.

Adding to 156016121 its reverse (121610651), we get a palindrome (277626772).

The spelling of 156016121 in words is "one hundred fifty-six million, sixteen thousand, one hundred twenty-one".