213661743 has 8 divisors (see below), whose sum is σ = 297268608. Its totient is φ = 136248024.

The previous prime is 213661687. The next prime is 213661757. The reversal of 213661743 is 347166312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213661743 - 2¹³ = 213653551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213661793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1548205 + ... + 1548342.

It is an arithmetic number, because the mean of its divisors is an integer number (37158576).

Almost surely, 2^213661743 is an apocalyptic number.

213661743 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

213661743 is a deficient number, since it is larger than the sum of its proper divisors (83606865).

213661743 is a wasteful number, since it uses less digits than its factorization.

213661743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096573.

The product of its digits is 18144, while the sum is 33.

The square root of 213661743 is about 14617.1728798698. The cubic root of 213661743 is about 597.8270874737.

The spelling of 213661743 in words is "two hundred thirteen million, six hundred sixty-one thousand, seven hundred forty-three".