155891147 has 2 divisors, whose sum is σ = 155891148. Its totient is φ = 155891146.

The previous prime is 155891129. The next prime is 155891159. The reversal of 155891147 is 741198551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155891147 - 2¹⁰ = 155890123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155891107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77945573 + 77945574.

It is an arithmetic number, because the mean of its divisors is an integer number (77945574).

Almost surely, 2^155891147 is an apocalyptic number.

155891147 is a deficient number, since it is larger than the sum of its proper divisors (1).

155891147 is an equidigital number, since it uses as much as digits as its factorization.

155891147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 41.

The square root of 155891147 is about 12485.6376288918. The cubic root of 155891147 is about 538.1960229204.

The spelling of 155891147 in words is "one hundred fifty-five million, eight hundred ninety-one thousand, one hundred forty-seven".