155881471 has 4 divisors (see below), whose sum is σ = 156352744. Its totient is φ = 155410200.

The previous prime is 155881447. The next prime is 155881487. The reversal of 155881471 is 174188551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 174188551 = 1459 ⋅119389.

It is a cyclic number.

It is not a de Polignac number, because 155881471 - 2⁷ = 155881343 is a prime.

It is a super-3 number, since 3×155881471³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155881441) 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, 235140 + ... + 235801.

It is an arithmetic number, because the mean of its divisors is an integer number (39088186).

Almost surely, 2^155881471 is an apocalyptic number.

155881471 is a deficient number, since it is larger than the sum of its proper divisors (471273).

155881471 is an equidigital number, since it uses as much as digits as its factorization.

155881471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471272.

The product of its digits is 44800, while the sum is 40.

The square root of 155881471 is about 12485.2501376624. The cubic root of 155881471 is about 538.1848876025.

The spelling of 155881471 in words is "one hundred fifty-five million, eight hundred eighty-one thousand, four hundred seventy-one".