145199979 has 16 divisors (see below), whose sum is σ = 217332640. Its totient is φ = 95800320.

The previous prime is 145199917. The next prime is 145199981. The reversal of 145199979 is 979991541.

It is not a de Polignac number, because 145199979 - 2¹¹ = 145197931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145199279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25102 + ... + 30339.

It is an arithmetic number, because the mean of its divisors is an integer number (13583290).

Almost surely, 2^145199979 is an apocalyptic number.

145199979 is a deficient number, since it is larger than the sum of its proper divisors (72132661).

145199979 is an equidigital number, since it uses as much as digits as its factorization.

145199979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55547 (or 55541 counting only the distinct ones).

The product of its digits is 918540, while the sum is 54.

The square root of 145199979 is about 12049.8953937368. The cubic root of 145199979 is about 525.6001952106.

The spelling of 145199979 in words is "one hundred forty-five million, one hundred ninety-nine thousand, nine hundred seventy-nine".