145205649 has 32 divisors (see below), whose sum is σ = 222382080. Its totient is φ = 93571200.

The previous prime is 145205629. The next prime is 145205659. The reversal of 145205649 is 946502541.

145205649 is a `hidden beast` number, since 1 + 4 + 5 + 2 + 0 + 5 + 649 = 666.

It is not a de Polignac number, because 145205649 - 2⁵ = 145205617 is a prime.

It is a super-2 number, since 2×145205649² = 42169361003022402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145205609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190429 + ... + 191189.

It is an arithmetic number, because the mean of its divisors is an integer number (6949440).

Almost surely, 2^145205649 is an apocalyptic number.

It is an amenable number.

145205649 is a deficient number, since it is larger than the sum of its proper divisors (77176431).

145205649 is a wasteful number, since it uses less digits than its factorization.

145205649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998 (or 992 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 145205649 is about 12050.1306631920. The cubic root of 145205649 is about 525.6070366127.

The spelling of 145205649 in words is "one hundred forty-five million, two hundred five thousand, six hundred forty-nine".