202991257 has 4 divisors (see below), whose sum is σ = 231990016. Its totient is φ = 173992500.

The previous prime is 202991251. The next prime is 202991273. The reversal of 202991257 is 752199202.

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 a cyclic number.

It is not a de Polignac number, because 202991257 - 2³ = 202991249 is a prime.

It is the 14248-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202991251) by changing a digit.

It is a nontrivial repunit in base 14247.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14499369 + ... + 14499382.

It is an arithmetic number, because the mean of its divisors is an integer number (57997504).

Almost surely, 2^202991257 is an apocalyptic number.

It is an amenable number.

202991257 is a deficient number, since it is larger than the sum of its proper divisors (28998759).

202991257 is an equidigital number, since it uses as much as digits as its factorization.

202991257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28998758.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 202991257 is about 14247.5000263204. The cubic root of 202991257 is about 587.7046284020.

The spelling of 202991257 in words is "two hundred two million, nine hundred ninety-one thousand, two hundred fifty-seven".