1972164889 has 2 divisors, whose sum is σ = 1972164890. Its totient is φ = 1972164888.

The previous prime is 1972164853. The next prime is 1972164893. The reversal of 1972164889 is 9884612791.

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., 1625460489 + 346704400 = 40317^2 + 18620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1972164889 - 2⁹ = 1972164377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1972164989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986082444 + 986082445.

It is an arithmetic number, because the mean of its divisors is an integer number (986082445).

Almost surely, 2^1972164889 is an apocalyptic number.

It is an amenable number.

1972164889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972164889 is an equidigital number, since it uses as much as digits as its factorization.

1972164889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 55.

The square root of 1972164889 is about 44409.0631403095. The cubic root of 1972164889 is about 1254.0487151529.

The spelling of 1972164889 in words is "one billion, nine hundred seventy-two million, one hundred sixty-four thousand, eight hundred eighty-nine".