1009197218 has 4 divisors (see below), whose sum is σ = 1513795830. Its totient is φ = 504598608.

The previous prime is 1009197209. The next prime is 1009197223. The reversal of 1009197218 is 8127919001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 651117289 + 358079929 = 25517^2 + 18923^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252299303 + ... + 252299306.

Almost surely, 2^1009197218 is an apocalyptic number.

1009197218 is a deficient number, since it is larger than the sum of its proper divisors (504598612).

1009197218 is an equidigital number, since it uses as much as digits as its factorization.

1009197218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504598611.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 1009197218 is about 31767.8645489432. The cubic root of 1009197218 is about 1003.0563883068.

The spelling of 1009197218 in words is "one billion, nine million, one hundred ninety-seven thousand, two hundred eighteen".