199193999437 has 2 divisors, whose sum is σ = 199193999438. Its totient is φ = 199193999436.

The previous prime is 199193999359. The next prime is 199193999467. The reversal of 199193999437 is 734999391991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197901309321 + 1292690116 = 444861^2 + 35954^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199193999437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199193999437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199193999467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99596999718 + 99596999719.

It is an arithmetic number, because the mean of its divisors is an integer number (99596999719).

Almost surely, 2^199193999437 is an apocalyptic number.

It is an amenable number.

199193999437 is a deficient number, since it is larger than the sum of its proper divisors (1).

199193999437 is an equidigital number, since it uses as much as digits as its factorization.

199193999437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 133923132, while the sum is 73.

The spelling of 199193999437 in words is "one hundred ninety-nine billion, one hundred ninety-three million, nine hundred ninety-nine thousand, four hundred thirty-seven".