155348381 has 2 divisors, whose sum is σ = 155348382. Its totient is φ = 155348380.

The previous prime is 155348341. The next prime is 155348387. The reversal of 155348381 is 183843551.

155348381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133772356 + 21576025 = 11566^2 + 4645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155348381 is a prime.

It is a super-2 number, since 2×155348381² = 48266238958642322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155348387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77674190 + 77674191.

It is an arithmetic number, because the mean of its divisors is an integer number (77674191).

Almost surely, 2^155348381 is an apocalyptic number.

It is an amenable number.

155348381 is a deficient number, since it is larger than the sum of its proper divisors (1).

155348381 is an equidigital number, since it uses as much as digits as its factorization.

155348381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 38.

The square root of 155348381 is about 12463.8830626735. The cubic root of 155348381 is about 537.5706844846.

The spelling of 155348381 in words is "one hundred fifty-five million, three hundred forty-eight thousand, three hundred eighty-one".