145661289 has 8 divisors (see below), whose sum is σ = 194504640. Its totient is φ = 96962736.

The previous prime is 145661279. The next prime is 145661293. The reversal of 145661289 is 982166541.

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

It is not a de Polignac number, because 145661289 - 2²⁴ = 128884073 is a prime.

It is a super-2 number, since 2×145661289² = 42434422226283042, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145661289.

It is not an unprimeable number, because it can be changed into a prime (145661249) 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, 33829 + ... + 37890.

It is an arithmetic number, because the mean of its divisors is an integer number (24313080).

Almost surely, 2^145661289 is an apocalyptic number.

It is an amenable number.

145661289 is a deficient number, since it is larger than the sum of its proper divisors (48843351).

145661289 is an equidigital number, since it uses as much as digits as its factorization.

145661289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72399.

The product of its digits is 103680, while the sum is 42.

The square root of 145661289 is about 12069.0218742034. The cubic root of 145661289 is about 526.1562290442.

The spelling of 145661289 in words is "one hundred forty-five million, six hundred sixty-one thousand, two hundred eighty-nine".