145172553 has 4 divisors (see below), whose sum is σ = 193563408. Its totient is φ = 96781700.

The previous prime is 145172551. The next prime is 145172563. The reversal of 145172553 is 355271541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145172553 - 2¹ = 145172551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145172551) 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 3 ways as a sum of consecutive naturals, for example, 24195423 + ... + 24195428.

It is an arithmetic number, because the mean of its divisors is an integer number (48390852).

Almost surely, 2^145172553 is an apocalyptic number.

It is an amenable number.

145172553 is a deficient number, since it is larger than the sum of its proper divisors (48390855).

145172553 is an equidigital number, since it uses as much as digits as its factorization.

145172553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48390854.

The product of its digits is 21000, while the sum is 33.

The square root of 145172553 is about 12048.7573218154. The cubic root of 145172553 is about 525.5671005808.

The spelling of 145172553 in words is "one hundred forty-five million, one hundred seventy-two thousand, five hundred fifty-three".