145696321 has 4 divisors (see below), whose sum is σ = 145826500. Its totient is φ = 145566144.

The previous prime is 145696219. The next prime is 145696339. The reversal of 145696321 is 123696541.

145696321 = T₉₈₅₄ + T₉₈₅₅ + T₉₈₅₆.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78127921 + 67568400 = 8839^2 + 8220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145696321 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145696021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63396 + ... + 65653.

It is an arithmetic number, because the mean of its divisors is an integer number (36456625).

Almost surely, 2^145696321 is an apocalyptic number.

145696321 is the 9856-th centered triangular number.

It is an amenable number.

145696321 is a deficient number, since it is larger than the sum of its proper divisors (130179).

145696321 is a wasteful number, since it uses less digits than its factorization.

145696321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130178.

The product of its digits is 38880, while the sum is 37.

The square root of 145696321 is about 12070.4731058894. The cubic root of 145696321 is about 526.1984064080.

The spelling of 145696321 in words is "one hundred forty-five million, six hundred ninety-six thousand, three hundred twenty-one".