145661039 has 4 divisors (see below), whose sum is σ = 145947720. Its totient is φ = 145374360.

The previous prime is 145660969. The next prime is 145661041. The reversal of 145661039 is 930166541.

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

It is a cyclic number.

It is not a de Polignac number, because 145661039 - 2¹² = 145656943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145661639) 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, 142577 + ... + 143594.

It is an arithmetic number, because the mean of its divisors is an integer number (36486930).

Almost surely, 2^145661039 is an apocalyptic number.

145661039 is a deficient number, since it is larger than the sum of its proper divisors (286681).

145661039 is an equidigital number, since it uses as much as digits as its factorization.

145661039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286680.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 145661039 is about 12069.0115171045. The cubic root of 145661039 is about 526.1559280282.

The spelling of 145661039 in words is "one hundred forty-five million, six hundred sixty-one thousand, thirty-nine".