145245977 has 4 divisors (see below), whose sum is σ = 153789876. Its totient is φ = 136702080.

The previous prime is 145245929. The next prime is 145246009. The reversal of 145245977 is 779542541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 779542541 = 277 ⋅2814233.

It can be written as a sum of positive squares in 2 ways, for example, as 130965136 + 14280841 = 11444^2 + 3779^2 .

It is a cyclic number.

It is not a de Polignac number, because 145245977 - 2⁸ = 145245721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145235977) 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, 4271924 + ... + 4271957.

It is an arithmetic number, because the mean of its divisors is an integer number (38447469).

Almost surely, 2^145245977 is an apocalyptic number.

145245977 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

145245977 is a deficient number, since it is larger than the sum of its proper divisors (8543899).

145245977 is an equidigital number, since it uses as much as digits as its factorization.

145245977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8543898.

The product of its digits is 352800, while the sum is 44.

The square root of 145245977 is about 12051.8038898747. The cubic root of 145245977 is about 525.6556910985.

The spelling of 145245977 in words is "one hundred forty-five million, two hundred forty-five thousand, nine hundred seventy-seven".