1972159289 has 2 divisors, whose sum is σ = 1972159290. Its totient is φ = 1972159288.

The previous prime is 1972159253. The next prime is 1972159337. The reversal of 1972159289 is 9829512791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1031694400 + 940464889 = 32120^2 + 30667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1972159289 is a prime.

It is a super-2 number, since 2×1972159289² = 7778824522377971042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1972159289.

It is not a weakly prime, because it can be changed into another prime (1972159589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986079644 + 986079645.

It is an arithmetic number, because the mean of its divisors is an integer number (986079645).

Almost surely, 2^1972159289 is an apocalyptic number.

It is an amenable number.

1972159289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972159289 is an equidigital number, since it uses as much as digits as its factorization.

1972159289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 53.

The square root of 1972159289 is about 44409.0000900718. Note that the first 4 decimals coincide. The cubic root of 1972159289 is about 1254.0475281866.

The spelling of 1972159289 in words is "one billion, nine hundred seventy-two million, one hundred fifty-nine thousand, two hundred eighty-nine".