213686465 has 8 divisors (see below), whose sum is σ = 262678248. Its totient is φ = 166779520.

The previous prime is 213686453. The next prime is 213686497. The reversal of 213686465 is 564686312.

213686465 = 10336² + 10337².

It can be written as a sum of positive squares in 4 ways, for example, as 1343281 + 212343184 = 1159^2 + 14572^2 .

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

It is not a de Polignac number, because 213686465 - 2⁴ = 213686449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 520982 + ... + 521391.

It is an arithmetic number, because the mean of its divisors is an integer number (32834781).

Almost surely, 2^213686465 is an apocalyptic number.

213686465 is the 10337-th centered square number.

It is an amenable number.

213686465 is a deficient number, since it is larger than the sum of its proper divisors (48991783).

213686465 is a wasteful number, since it uses less digits than its factorization.

213686465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042419.

The product of its digits is 207360, while the sum is 41.

The square root of 213686465 is about 14618.0185045717. The cubic root of 213686465 is about 597.8501440288.

The spelling of 213686465 in words is "two hundred thirteen million, six hundred eighty-six thousand, four hundred sixty-five".