156643213 has 2 divisors, whose sum is σ = 156643214. Its totient is φ = 156643212.

The previous prime is 156643189. The next prime is 156643231. The reversal of 156643213 is 312346651.

Together with next prime (156643231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96766569 + 59876644 = 9837^2 + 7738^2 .

It is a cyclic number.

It is not a de Polignac number, because 156643213 - 2¹³ = 156635021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156643243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78321606 + 78321607.

It is an arithmetic number, because the mean of its divisors is an integer number (78321607).

Almost surely, 2^156643213 is an apocalyptic number.

It is an amenable number.

156643213 is a deficient number, since it is larger than the sum of its proper divisors (1).

156643213 is an equidigital number, since it uses as much as digits as its factorization.

156643213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 156643213 is about 12515.7186369781. The cubic root of 156643213 is about 539.0601082854.

Adding to 156643213 its reverse (312346651), we get a palindrome (468989864).

The spelling of 156643213 in words is "one hundred fifty-six million, six hundred forty-three thousand, two hundred thirteen".