145364721 has 16 divisors (see below), whose sum is σ = 198979200. Its totient is φ = 94340480.

The previous prime is 145364719. The next prime is 145364759. The reversal of 145364721 is 127463541.

It is a cyclic number.

It is not a de Polignac number, because 145364721 - 2¹ = 145364719 is a prime.

It is a super-2 number, since 2×145364721² = 42261804222815682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145364701) 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 15 ways as a sum of consecutive naturals, for example, 72691 + ... + 74663.

It is an arithmetic number, because the mean of its divisors is an integer number (12436200).

Almost surely, 2^145364721 is an apocalyptic number.

It is an amenable number.

145364721 is a deficient number, since it is larger than the sum of its proper divisors (53614479).

145364721 is a wasteful number, since it uses less digits than its factorization.

145364721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616.

The product of its digits is 20160, while the sum is 33.

The square root of 145364721 is about 12056.7292828528. The cubic root of 145364721 is about 525.7988997862.

The spelling of 145364721 in words is "one hundred forty-five million, three hundred sixty-four thousand, seven hundred twenty-one".