190435843721 has 2 divisors, whose sum is σ = 190435843722. Its totient is φ = 190435843720.

The previous prime is 190435843711. The next prime is 190435843771. The reversal of 190435843721 is 127348534091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133637038096 + 56798805625 = 365564^2 + 238325^2 .

It is a cyclic number.

It is not a de Polignac number, because 190435843721 - 2¹⁰ = 190435842697 is a prime.

It is not a weakly prime, because it can be changed into another prime (190435843711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95217921860 + 95217921861.

It is an arithmetic number, because the mean of its divisors is an integer number (95217921861).

Almost surely, 2^190435843721 is an apocalyptic number.

It is an amenable number.

190435843721 is a deficient number, since it is larger than the sum of its proper divisors (1).

190435843721 is an equidigital number, since it uses as much as digits as its factorization.

190435843721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 190435843721 in words is "one hundred ninety billion, four hundred thirty-five million, eight hundred forty-three thousand, seven hundred twenty-one".