1144787997 has 4 divisors (see below), whose sum is σ = 1526384000. Its totient is φ = 763191996.

The previous prime is 1144787983. The next prime is 1144788017. The reversal of 1144787997 is 7997874411.

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: 7997874411 = 3 ⋅2665958137.

It is not a de Polignac number, because 1144787997 - 2¹⁹ = 1144263709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144787597) 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, 190797997 + ... + 190798002.

It is an arithmetic number, because the mean of its divisors is an integer number (381596000).

Almost surely, 2^1144787997 is an apocalyptic number.

It is an amenable number.

1144787997 is a deficient number, since it is larger than the sum of its proper divisors (381596003).

1144787997 is an equidigital number, since it uses as much as digits as its factorization.

1144787997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381596002.

The product of its digits is 3556224, while the sum is 57.

The square root of 1144787997 is about 33834.7158551686. The cubic root of 1144787997 is about 1046.1043846681.

The spelling of 1144787997 in words is "one billion, one hundred forty-four million, seven hundred eighty-seven thousand, nine hundred ninety-seven".