144979691 has 4 divisors (see below), whose sum is σ = 145003800. Its totient is φ = 144955584.

The previous prime is 144979687. The next prime is 144979693. The reversal of 144979691 is 196979441.

It is a happy number.

144979691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 196979441 = 19 ⋅10367339.

It is a cyclic number.

It is not a de Polignac number, because 144979691 - 2² = 144979687 is a prime.

It is a super-2 number, since 2×144979691² = 42038221604910962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144979693) 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, 5180 + ... + 17798.

It is an arithmetic number, because the mean of its divisors is an integer number (36250950).

Almost surely, 2^144979691 is an apocalyptic number.

144979691 is a deficient number, since it is larger than the sum of its proper divisors (24109).

144979691 is a wasteful number, since it uses less digits than its factorization.

144979691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24108.

The product of its digits is 489888, while the sum is 50.

The square root of 144979691 is about 12040.7512639370. The cubic root of 144979691 is about 525.3342584912.

The spelling of 144979691 in words is "one hundred forty-four million, nine hundred seventy-nine thousand, six hundred ninety-one".