201457993 has 4 divisors (see below), whose sum is σ = 219772368. Its totient is φ = 183143620.

The previous prime is 201457961. The next prime is 201458017. The reversal of 201457993 is 399754102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 201457993 - 2⁵ = 201457961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201457903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9157171 + ... + 9157192.

It is an arithmetic number, because the mean of its divisors is an integer number (54943092).

Almost surely, 2^201457993 is an apocalyptic number.

It is an amenable number.

201457993 is a deficient number, since it is larger than the sum of its proper divisors (18314375).

201457993 is a wasteful number, since it uses less digits than its factorization.

201457993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18314374.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 201457993 is about 14193.5898559878. The cubic root of 201457993 is about 586.2211741850.

The spelling of 201457993 in words is "two hundred one million, four hundred fifty-seven thousand, nine hundred ninety-three".