156121213 has 2 divisors, whose sum is σ = 156121214. Its totient is φ = 156121212.

The previous prime is 156121211. The next prime is 156121223. The reversal of 156121213 is 312121651.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104898564 + 51222649 = 10242^2 + 7157^2 .

It is an emirp because it is prime and its reverse (312121651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156121213 - 2¹ = 156121211 is a prime.

Together with 156121211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156121211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78060606 + 78060607.

It is an arithmetic number, because the mean of its divisors is an integer number (78060607).

Almost surely, 2^156121213 is an apocalyptic number.

It is an amenable number.

156121213 is a deficient number, since it is larger than the sum of its proper divisors (1).

156121213 is an equidigital number, since it uses as much as digits as its factorization.

156121213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 22.

The square root of 156121213 is about 12494.8474580525. The cubic root of 156121213 is about 538.4606514695.

Adding to 156121213 its reverse (312121651), we get a palindrome (468242864).

The spelling of 156121213 in words is "one hundred fifty-six million, one hundred twenty-one thousand, two hundred thirteen".