145331555 has 8 divisors (see below), whose sum is σ = 184656672. Its totient is φ = 109426048.

The previous prime is 145331507. The next prime is 145331569. The reversal of 145331555 is 555133541.

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 145331555 - 2⁸ = 145331299 is a prime.

It is a super-2 number, since 2×145331555² = 42242521757436050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854807 + ... + 854976.

It is an arithmetic number, because the mean of its divisors is an integer number (23082084).

Almost surely, 2^145331555 is an apocalyptic number.

145331555 is a deficient number, since it is larger than the sum of its proper divisors (39325117).

145331555 is a wasteful number, since it uses less digits than its factorization.

145331555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709805.

The product of its digits is 22500, while the sum is 32.

The square root of 145331555 is about 12055.3537899143. The cubic root of 145331555 is about 525.7589084857.

The spelling of 145331555 in words is "one hundred forty-five million, three hundred thirty-one thousand, five hundred fifty-five".