202149491 has 4 divisors (see below), whose sum is σ = 206450592. Its totient is φ = 197848392.

The previous prime is 202149487. The next prime is 202149511. The reversal of 202149491 is 194941202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194941202 = 2 ⋅97470601.

It is a cyclic number.

It is not a de Polignac number, because 202149491 - 2² = 202149487 is a prime.

It is a super-3 number, since 3×202149491³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202149421) by changing a digit.

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, 2150480 + ... + 2150573.

It is an arithmetic number, because the mean of its divisors is an integer number (51612648).

Almost surely, 2^202149491 is an apocalyptic number.

202149491 is a deficient number, since it is larger than the sum of its proper divisors (4301101).

202149491 is an equidigital number, since it uses as much as digits as its factorization.

202149491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4301100.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 202149491 is about 14217.9285059393. The cubic root of 202149491 is about 586.8911365902.

The spelling of 202149491 in words is "two hundred two million, one hundred forty-nine thousand, four hundred ninety-one".