155451881 has 8 divisors (see below), whose sum is σ = 167697600. Its totient is φ = 143247312.

The previous prime is 155451839. The next prime is 155451883. The reversal of 155451881 is 188154551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155451881 - 2⁶ = 155451817 is a prime.

It is a super-4 number, since 4×155451881⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155451883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2195 + ... + 17768.

It is an arithmetic number, because the mean of its divisors is an integer number (20962200).

Almost surely, 2^155451881 is an apocalyptic number.

It is an amenable number.

155451881 is a deficient number, since it is larger than the sum of its proper divisors (12245719).

155451881 is a wasteful number, since it uses less digits than its factorization.

155451881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20575.

The product of its digits is 32000, while the sum is 38.

The square root of 155451881 is about 12468.0343679347. The cubic root of 155451881 is about 537.6900424802.

It can be divided in two parts, 1554 and 51881, that added together give a palindrome (53435).

The spelling of 155451881 in words is "one hundred fifty-five million, four hundred fifty-one thousand, eight hundred eighty-one".