155551145 has 8 divisors (see below), whose sum is σ = 191706504. Its totient is φ = 121077504.

The previous prime is 155551141. The next prime is 155551177. The reversal of 155551145 is 541155551.

It can be written as a sum of positive squares in 4 ways, for example, as 55771024 + 99780121 = 7468^2 + 9989^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 155551145 - 2² = 155551141 is a prime.

It is a super-2 number, since 2×155551145² = 48392317421622050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155551141) 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, 420224 + ... + 420593.

It is an arithmetic number, because the mean of its divisors is an integer number (23963313).

Almost surely, 2^155551145 is an apocalyptic number.

It is an amenable number.

155551145 is a deficient number, since it is larger than the sum of its proper divisors (36155359).

155551145 is an equidigital number, since it uses as much as digits as its factorization.

155551145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840859.

The product of its digits is 12500, while the sum is 32.

The square root of 155551145 is about 12472.0144724098. The cubic root of 155551145 is about 537.8044656863.

The spelling of 155551145 in words is "one hundred fifty-five million, five hundred fifty-one thousand, one hundred forty-five".