155206091 has 2 divisors, whose sum is σ = 155206092. Its totient is φ = 155206090.

The previous prime is 155206087. The next prime is 155206097. The reversal of 155206091 is 190602551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155206091 - 2² = 155206087 is a prime.

It is not a weakly prime, because it can be changed into another prime (155206097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77603045 + 77603046.

It is an arithmetic number, because the mean of its divisors is an integer number (77603046).

Almost surely, 2^155206091 is an apocalyptic number.

155206091 is a deficient number, since it is larger than the sum of its proper divisors (1).

155206091 is an equidigital number, since it uses as much as digits as its factorization.

155206091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 155206091 is about 12458.1736622990. The cubic root of 155206091 is about 537.4065066158.

The spelling of 155206091 in words is "one hundred fifty-five million, two hundred six thousand, ninety-one".