145553321 has 8 divisors (see below), whose sum is σ = 150197544. Its totient is φ = 140961280.

The previous prime is 145553299. The next prime is 145553327. The reversal of 145553321 is 123355541.

It can be written as a sum of positive squares in 4 ways, for example, as 6431296 + 139122025 = 2536^2 + 11795^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-145553321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145553327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7340 + ... + 18573.

It is an arithmetic number, because the mean of its divisors is an integer number (18774693).

Almost surely, 2^145553321 is an apocalyptic number.

It is an amenable number.

145553321 is a deficient number, since it is larger than the sum of its proper divisors (4644223).

145553321 is a wasteful number, since it uses less digits than its factorization.

145553321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26091.

The product of its digits is 9000, while the sum is 29.

The square root of 145553321 is about 12064.5481059176. The cubic root of 145553321 is about 526.0261966067.

The spelling of 145553321 in words is "one hundred forty-five million, five hundred fifty-three thousand, three hundred twenty-one".