201143978 has 16 divisors (see below), whose sum is σ = 346135680. Its totient is φ = 85875216.

The previous prime is 201143977. The next prime is 201144037. The reversal of 201143978 is 879341102.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201143977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23633 + ... + 30996.

It is an arithmetic number, because the mean of its divisors is an integer number (21633480).

Almost surely, 2^201143978 is an apocalyptic number.

201143978 is a deficient number, since it is larger than the sum of its proper divisors (144991702).

201143978 is a wasteful number, since it uses less digits than its factorization.

201143978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54901.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 201143978 is about 14182.5236823352. The cubic root of 201143978 is about 585.9164324604.

The spelling of 201143978 in words is "two hundred one million, one hundred forty-three thousand, nine hundred seventy-eight".