144691487 has 4 divisors (see below), whose sum is σ = 144758856. Its totient is φ = 144624120.

The previous prime is 144691453. The next prime is 144691529. The reversal of 144691487 is 784196441.

It is a happy number.

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 144691487 - 2⁸ = 144691231 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 (144691387) 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, 30353 + ... + 34794.

It is an arithmetic number, because the mean of its divisors is an integer number (36189714).

Almost surely, 2^144691487 is an apocalyptic number.

144691487 is a deficient number, since it is larger than the sum of its proper divisors (67369).

144691487 is an equidigital number, since it uses as much as digits as its factorization.

144691487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67368.

The product of its digits is 193536, while the sum is 44.

The square root of 144691487 is about 12028.7774524263. Note that the first 3 decimals coincide. The cubic root of 144691487 is about 524.9859249439.

The spelling of 144691487 in words is "one hundred forty-four million, six hundred ninety-one thousand, four hundred eighty-seven".