144187691 has 2 divisors, whose sum is σ = 144187692. Its totient is φ = 144187690.

The previous prime is 144187663. The next prime is 144187699. The reversal of 144187691 is 196781441.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 144187691 - 2¹⁰ = 144186667 is a prime.

It is a super-2 number, since 2×144187691² = 41580180471822962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (144187699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72093845 + 72093846.

It is an arithmetic number, because the mean of its divisors is an integer number (72093846).

Almost surely, 2^144187691 is an apocalyptic number.

144187691 is a deficient number, since it is larger than the sum of its proper divisors (1).

144187691 is an equidigital number, since it uses as much as digits as its factorization.

144187691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 144187691 is about 12007.8179116774. The cubic root of 144187691 is about 524.3759066272.

The spelling of 144187691 in words is "one hundred forty-four million, one hundred eighty-seven thousand, six hundred ninety-one".