213813731 has 8 divisors (see below), whose sum is σ = 217292544. Its totient is φ = 210348040.

The previous prime is 213813703. The next prime is 213813739. The reversal of 213813731 is 137318312.

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

It is a cyclic number.

It is not a de Polignac number, because 213813731 - 2¹⁰ = 213812707 is a prime.

It is a super-2 number, since 2×213813731² = 91432623128280722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213813694 and 213813703.

It is not an unprimeable number, because it can be changed into a prime (213813739) 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, 32720 + ... + 38706.

It is an arithmetic number, because the mean of its divisors is an integer number (27161568).

Almost surely, 2^213813731 is an apocalyptic number.

213813731 is a deficient number, since it is larger than the sum of its proper divisors (3478813).

213813731 is an equidigital number, since it uses as much as digits as its factorization.

213813731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561.

The product of its digits is 3024, while the sum is 29.

The square root of 213813731 is about 14622.3709089874. The cubic root of 213813731 is about 597.9688083789.

The spelling of 213813731 in words is "two hundred thirteen million, eight hundred thirteen thousand, seven hundred thirty-one".