155651191 has 2 divisors, whose sum is σ = 155651192. Its totient is φ = 155651190.

The previous prime is 155651183. The next prime is 155651203. The reversal of 155651191 is 191156551.

155651191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155651191 - 2³ = 155651183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155651141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77825595 + 77825596.

It is an arithmetic number, because the mean of its divisors is an integer number (77825596).

Almost surely, 2^155651191 is an apocalyptic number.

155651191 is a deficient number, since it is larger than the sum of its proper divisors (1).

155651191 is an equidigital number, since it uses as much as digits as its factorization.

155651191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6750, while the sum is 34.

The square root of 155651191 is about 12476.0246472985. The cubic root of 155651191 is about 537.9197410713.

The spelling of 155651191 in words is "one hundred fifty-five million, six hundred fifty-one thousand, one hundred ninety-one".