155387171 has 4 divisors (see below), whose sum is σ = 159177144. Its totient is φ = 151597200.

The previous prime is 155387117. The next prime is 155387201. The reversal of 155387171 is 171783551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155387171 is a prime.

It is a super-2 number, since 2×155387171² = 48290345822766482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155387101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1894925 + ... + 1895006.

It is an arithmetic number, because the mean of its divisors is an integer number (39794286).

Almost surely, 2^155387171 is an apocalyptic number.

155387171 is a deficient number, since it is larger than the sum of its proper divisors (3789973).

155387171 is an equidigital number, since it uses as much as digits as its factorization.

155387171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789972.

The product of its digits is 29400, while the sum is 38.

The square root of 155387171 is about 12465.4390616616. The cubic root of 155387171 is about 537.6154239949.

The spelling of 155387171 in words is "one hundred fifty-five million, three hundred eighty-seven thousand, one hundred seventy-one".