1144187909 has 2 divisors, whose sum is σ = 1144187910. Its totient is φ = 1144187908.

The previous prime is 1144187899. The next prime is 1144187917. The reversal of 1144187909 is 9097814411.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995591809 + 148596100 = 31553^2 + 12190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1144187909 is a prime.

It is a super-2 number, since 2×1144187909² = 2618331942203584562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1144187909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1144087909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572093954 + 572093955.

It is an arithmetic number, because the mean of its divisors is an integer number (572093955).

Almost surely, 2^1144187909 is an apocalyptic number.

It is an amenable number.

1144187909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1144187909 is an equidigital number, since it uses as much as digits as its factorization.

1144187909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 1144187909 is about 33825.8467595417. The cubic root of 1144187909 is about 1045.9215664202.

The spelling of 1144187909 in words is "one billion, one hundred forty-four million, one hundred eighty-seven thousand, nine hundred nine".