145881287 has 4 divisors (see below), whose sum is σ = 146095560. Its totient is φ = 145667016.

The previous prime is 145881271. The next prime is 145881289. The reversal of 145881287 is 782188541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782188541 = 101 ⋅7744441.

It is a cyclic number.

It is not a de Polignac number, because 145881287 - 2⁴ = 145881271 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 (145881289) 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, 106112 + ... + 107477.

It is an arithmetic number, because the mean of its divisors is an integer number (36523890).

Almost surely, 2^145881287 is an apocalyptic number.

145881287 is a deficient number, since it is larger than the sum of its proper divisors (214273).

145881287 is an equidigital number, since it uses as much as digits as its factorization.

145881287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214272.

The product of its digits is 143360, while the sum is 44.

The square root of 145881287 is about 12078.1325957285. The cubic root of 145881287 is about 526.4209873112.

The spelling of 145881287 in words is "one hundred forty-five million, eight hundred eighty-one thousand, two hundred eighty-seven".