156900409 has 2 divisors, whose sum is σ = 156900410. Its totient is φ = 156900408.

The previous prime is 156900407. The next prime is 156900431. The reversal of 156900409 is 904009651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116704809 + 40195600 = 10803^2 + 6340^2 .

It is an emirp because it is prime and its reverse (904009651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156900409 - 2¹ = 156900407 is a prime.

Together with 156900407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (156900407) 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 as a sum of consecutive naturals, namely, 78450204 + 78450205.

It is an arithmetic number, because the mean of its divisors is an integer number (78450205).

Almost surely, 2^156900409 is an apocalyptic number.

It is an amenable number.

156900409 is a deficient number, since it is larger than the sum of its proper divisors (1).

156900409 is an equidigital number, since it uses as much as digits as its factorization.

156900409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 156900409 is about 12525.9893421638. The cubic root of 156900409 is about 539.3549785815.

The spelling of 156900409 in words is "one hundred fifty-six million, nine hundred thousand, four hundred nine".