201011101993 has 4 divisors (see below), whose sum is σ = 216473494468. Its totient is φ = 185548709520.

The previous prime is 201011101943. The next prime is 201011101997. The reversal of 201011101993 is 399101110102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114415092009 + 86596009984 = 338253^2 + 294272^2 .

It is a cyclic number.

It is not a de Polignac number, because 201011101993 - 2²¹ = 201009004841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201011101997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7731196218 + ... + 7731196243.

It is an arithmetic number, because the mean of its divisors is an integer number (54118373617).

Almost surely, 2^201011101993 is an apocalyptic number.

It is an amenable number.

201011101993 is a deficient number, since it is larger than the sum of its proper divisors (15462392475).

201011101993 is a wasteful number, since it uses less digits than its factorization.

201011101993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15462392474.

The product of its (nonzero) digits is 486, while the sum is 28.

The spelling of 201011101993 in words is "two hundred one billion, eleven million, one hundred one thousand, nine hundred ninety-three".