201397771 has 4 divisors (see below), whose sum is σ = 206840992. Its totient is φ = 195954552.

The previous prime is 201397769. The next prime is 201397829. The reversal of 201397771 is 177793102.

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

It is a cyclic number.

It is not a de Polignac number, because 201397771 - 2¹ = 201397769 is a prime.

It is a super-2 number, since 2×201397771² = 81122124327536882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 5443183 = 201397771 / (2 + 0 + 1 + 3 + 9 + 7 + 7 + 7 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201397771.

It is not an unprimeable number, because it can be changed into a prime (201397711) 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, 2721555 + ... + 2721628.

It is an arithmetic number, because the mean of its divisors is an integer number (51710248).

Almost surely, 2^201397771 is an apocalyptic number.

201397771 is a deficient number, since it is larger than the sum of its proper divisors (5443221).

201397771 is an equidigital number, since it uses as much as digits as its factorization.

201397771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5443220.

The product of its (nonzero) digits is 18522, while the sum is 37.

The square root of 201397771 is about 14191.4682468024. The cubic root of 201397771 is about 586.1627551744.

The spelling of 201397771 in words is "two hundred one million, three hundred ninety-seven thousand, seven hundred seventy-one".