145172643 has 24 divisors (see below), whose sum is σ = 245638080. Its totient is φ = 75413520.

The previous prime is 145172633. The next prime is 145172669. The reversal of 145172643 is 346271541.

It is not a de Polignac number, because 145172643 - 2⁸ = 145172387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145172603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43273 + ... + 46506.

It is an arithmetic number, because the mean of its divisors is an integer number (10234920).

Almost surely, 2^145172643 is an apocalyptic number.

145172643 is a deficient number, since it is larger than the sum of its proper divisors (100465437).

145172643 is a wasteful number, since it uses less digits than its factorization.

145172643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89807 (or 89800 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 145172643 is about 12048.7610566398. The cubic root of 145172643 is about 525.5672091896.

The spelling of 145172643 in words is "one hundred forty-five million, one hundred seventy-two thousand, six hundred forty-three".