1142237209 has 3 divisors (see below), whose sum is σ = 1142271007. Its totient is φ = 1142203412.

The previous prime is 1142237203. The next prime is 1142237233. The reversal of 1142237209 is 9027322411.

The square root of 1142237209 is 33797.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 454329225 + 687907984 = 21315^2 + 26228^2 .

It is not a de Polignac number, because 1142237209 - 2²³ = 1133848601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1142237203) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 16899 + ... + 50695.

Almost surely, 2^1142237209 is an apocalyptic number.

1142237209 is the 33797-th square number.

1142237209 is the 16899-th centered octagonal number.

It is an amenable number.

1142237209 is a deficient number, since it is larger than the sum of its proper divisors (33798).

1142237209 is an frugal number, since it uses more digits than its factorization.

1142237209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67594 (or 33797 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The cubic root of 1142237209 is about 1045.3268389987.

The spelling of 1142237209 in words is "one billion, one hundred forty-two million, two hundred thirty-seven thousand, two hundred nine".