156133381 has 2 divisors, whose sum is σ = 156133382. Its totient is φ = 156133380.

The previous prime is 156133379. The next prime is 156133399. The reversal of 156133381 is 183331651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113230881 + 42902500 = 10641^2 + 6550^2 .

It is an emirp because it is prime and its reverse (183331651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156133381 - 2¹ = 156133379 is a prime.

It is a super-2 number, since 2×156133381² = 48755265324982322, which contains 22 as substring.

Together with 156133379, 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 (156133181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78066690 + 78066691.

It is an arithmetic number, because the mean of its divisors is an integer number (78066691).

Almost surely, 2^156133381 is an apocalyptic number.

It is an amenable number.

156133381 is a deficient number, since it is larger than the sum of its proper divisors (1).

156133381 is an equidigital number, since it uses as much as digits as its factorization.

156133381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 156133381 is about 12495.3343692756. The cubic root of 156133381 is about 538.4746402134.

The spelling of 156133381 in words is "one hundred fifty-six million, one hundred thirty-three thousand, three hundred eighty-one".