211451493 has 12 divisors (see below), whose sum is σ = 309896384. Its totient is φ = 128152200.

The previous prime is 211451483. The next prime is 211451509. The reversal of 211451493 is 394154112.

It is not a de Polignac number, because 211451493 - 2⁴ = 211451477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211451493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211451483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 290893 + ... + 291618.

Almost surely, 2^211451493 is an apocalyptic number.

It is an amenable number.

211451493 is a deficient number, since it is larger than the sum of its proper divisors (98444891).

211451493 is a wasteful number, since it uses less digits than its factorization.

211451493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582536 (or 582525 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 211451493 is about 14541.3717716039. The cubic root of 211451493 is about 595.7585063167.

The spelling of 211451493 in words is "two hundred eleven million, four hundred fifty-one thousand, four hundred ninety-three".