145220613 has 16 divisors (see below), whose sum is σ = 205370496. Its totient is φ = 90961920.

The previous prime is 145220587. The next prime is 145220617. The reversal of 145220613 is 316022541.

It is not a de Polignac number, because 145220613 - 2⁸ = 145220357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145220617) 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, 32208 + ... + 36438.

It is an arithmetic number, because the mean of its divisors is an integer number (12835656).

Almost surely, 2^145220613 is an apocalyptic number.

It is an amenable number.

145220613 is a deficient number, since it is larger than the sum of its proper divisors (60149883).

145220613 is a wasteful number, since it uses less digits than its factorization.

145220613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4924.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 145220613 is about 12050.7515533265. The cubic root of 145220613 is about 525.6250912673.

The spelling of 145220613 in words is "one hundred forty-five million, two hundred twenty thousand, six hundred thirteen".