155655091 has 2 divisors, whose sum is σ = 155655092. Its totient is φ = 155655090.

The previous prime is 155655001. The next prime is 155655107. The reversal of 155655091 is 190556551.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (190556551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155655091 - 2¹³ = 155646899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155655091.

It is not a weakly prime, because it can be changed into another prime (155655001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77827545 + 77827546.

It is an arithmetic number, because the mean of its divisors is an integer number (77827546).

Almost surely, 2^155655091 is an apocalyptic number.

155655091 is a deficient number, since it is larger than the sum of its proper divisors (1).

155655091 is an equidigital number, since it uses as much as digits as its factorization.

155655091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33750, while the sum is 37.

The square root of 155655091 is about 12476.1809461069. The cubic root of 155655091 is about 537.9242337438.

The spelling of 155655091 in words is "one hundred fifty-five million, six hundred fifty-five thousand, ninety-one".