213995491 has 6 divisors (see below), whose sum is σ = 217057076. Its totient is φ = 210976500.

The previous prime is 213995479. The next prime is 213995527. The reversal of 213995491 is 194599312.

It is not a de Polignac number, because 213995491 - 2⁷ = 213995363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213995401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16185 + ... + 26266.

Almost surely, 2^213995491 is an apocalyptic number.

213995491 is a deficient number, since it is larger than the sum of its proper divisors (3061585).

213995491 is an frugal number, since it uses more digits than its factorization.

213995491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42593 (or 42522 counting only the distinct ones).

The product of its digits is 87480, while the sum is 43.

The square root of 213995491 is about 14628.5847230687. The cubic root of 213995491 is about 598.1382019705.

The spelling of 213995491 in words is "two hundred thirteen million, nine hundred ninety-five thousand, four hundred ninety-one".