201953897 has 4 divisors (see below), whose sum is σ = 213833556. Its totient is φ = 190074240.

The previous prime is 201953887. The next prime is 201953911. The reversal of 201953897 is 798359102.

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 175933696 + 26020201 = 13264^2 + 5101^2 .

It is a cyclic number.

It is not a de Polignac number, because 201953897 - 2¹⁰ = 201952873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201953837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5939804 + ... + 5939837.

It is an arithmetic number, because the mean of its divisors is an integer number (53458389).

Almost surely, 2^201953897 is an apocalyptic number.

It is an amenable number.

201953897 is a deficient number, since it is larger than the sum of its proper divisors (11879659).

201953897 is a wasteful number, since it uses less digits than its factorization.

201953897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11879658.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 201953897 is about 14211.0484131186. The cubic root of 201953897 is about 586.7017892124.

The spelling of 201953897 in words is "two hundred one million, nine hundred fifty-three thousand, eight hundred ninety-seven".