145172983 has 4 divisors (see below), whose sum is σ = 147161728. Its totient is φ = 143184240.

The previous prime is 145172957. The next prime is 145173011. The reversal of 145172983 is 389271541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 389271541 = 67 ⋅5810023.

It is a cyclic number.

It is not a de Polignac number, because 145172983 - 2²¹ = 143075831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145172903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994263 + ... + 994408.

It is an arithmetic number, because the mean of its divisors is an integer number (36790432).

Almost surely, 2^145172983 is an apocalyptic number.

145172983 is a deficient number, since it is larger than the sum of its proper divisors (1988745).

145172983 is an equidigital number, since it uses as much as digits as its factorization.

145172983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988744.

The product of its digits is 60480, while the sum is 40.

The square root of 145172983 is about 12048.7751659660. The cubic root of 145172983 is about 525.5676194889.

The spelling of 145172983 in words is "one hundred forty-five million, one hundred seventy-two thousand, nine hundred eighty-three".