1973609899 has 2 divisors, whose sum is σ = 1973609900. Its totient is φ = 1973609898.

The previous prime is 1973609879. The next prime is 1973609903. The reversal of 1973609899 is 9989063791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1973609899 - 2⁵ = 1973609867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1973609839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986804949 + 986804950.

It is an arithmetic number, because the mean of its divisors is an integer number (986804950).

Almost surely, 2^1973609899 is an apocalyptic number.

1973609899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1973609899 is an equidigital number, since it uses as much as digits as its factorization.

1973609899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6613488, while the sum is 61.

The square root of 1973609899 is about 44425.3294754243. The cubic root of 1973609899 is about 1254.3549218912.

The spelling of 1973609899 in words is "one billion, nine hundred seventy-three million, six hundred nine thousand, eight hundred ninety-nine".