144691387 has 2 divisors, whose sum is σ = 144691388. Its totient is φ = 144691386.

The previous prime is 144691381. The next prime is 144691409. The reversal of 144691387 is 783196441.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144691387 is a prime.

It is not a weakly prime, because it can be changed into another prime (144691381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72345693 + 72345694.

It is an arithmetic number, because the mean of its divisors is an integer number (72345694).

Almost surely, 2^144691387 is an apocalyptic number.

144691387 is a deficient number, since it is larger than the sum of its proper divisors (1).

144691387 is an equidigital number, since it uses as much as digits as its factorization.

144691387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 144691387 is about 12028.7732957272. The cubic root of 144691387 is about 524.9858040001.

The spelling of 144691387 in words is "one hundred forty-four million, six hundred ninety-one thousand, three hundred eighty-seven".