201949866 has 12 divisors (see below), whose sum is σ = 437558082. Its totient is φ = 67316616.

The previous prime is 201949849. The next prime is 201949877. The reversal of 201949866 is 668949102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 154629225 + 47320641 = 12435^2 + 6879^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5609701 + ... + 5609736.

Almost surely, 2^201949866 is an apocalyptic number.

201949866 is an abundant number, since it is smaller than the sum of its proper divisors (235608216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201949866 is a wasteful number, since it uses less digits than its factorization.

201949866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11219445 (or 11219442 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 201949866 is about 14210.9065861401. The cubic root of 201949866 is about 586.6978856636.

The spelling of 201949866 in words is "two hundred one million, nine hundred forty-nine thousand, eight hundred sixty-six".