145121571 has 96 divisors (see below), whose sum is σ = 274544640. Its totient is φ = 73923840.

The previous prime is 145121567. The next prime is 145121573. The reversal of 145121571 is 175121541.

It is not a de Polignac number, because 145121571 - 2² = 145121567 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (145121573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3087670 + ... + 3087716.

It is an arithmetic number, because the mean of its divisors is an integer number (2859840).

Almost surely, 2^145121571 is an apocalyptic number.

145121571 is a deficient number, since it is larger than the sum of its proper divisors (129423069).

145121571 is a wasteful number, since it uses less digits than its factorization.

145121571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 105 counting only the distinct ones).

The product of its digits is 1400, while the sum is 27.

The square root of 145121571 is about 12046.6414821725. The cubic root of 145121571 is about 525.5055701272.

The spelling of 145121571 in words is "one hundred forty-five million, one hundred twenty-one thousand, five hundred seventy-one".