144967681 has 4 divisors (see below), whose sum is σ = 145081264. Its totient is φ = 144854100.

The previous prime is 144967657. The next prime is 144967709. The reversal of 144967681 is 186769441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186769441 = 409 ⋅456649.

It is a cyclic number.

It is not a de Polignac number, because 144967681 - 2⁵ = 144967649 is a prime.

It is a super-2 number, since 2×144967681² = 42031257069035522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144967181) 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, 54855 + ... + 57436.

It is an arithmetic number, because the mean of its divisors is an integer number (36270316).

Almost surely, 2^144967681 is an apocalyptic number.

It is an amenable number.

144967681 is a deficient number, since it is larger than the sum of its proper divisors (113583).

144967681 is a wasteful number, since it uses less digits than its factorization.

144967681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113582.

The product of its digits is 290304, while the sum is 46.

The square root of 144967681 is about 12040.2525305743. The cubic root of 144967681 is about 525.3197520027.

The spelling of 144967681 in words is "one hundred forty-four million, nine hundred sixty-seven thousand, six hundred eighty-one".