213091907 has 8 divisors (see below), whose sum is σ = 244434432. Its totient is φ = 181974600.

The previous prime is 213091873. The next prime is 213091919. The reversal of 213091907 is 709190312.

213091907 = 49² + 50² + ... + 861².

It is a happy number.

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 213091907 - 2¹⁸ = 212829763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213091927) by changing a digit.

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, 54269 + ... + 58062.

It is an arithmetic number, because the mean of its divisors is an integer number (30554304).

Almost surely, 2^213091907 is an apocalyptic number.

213091907 is a deficient number, since it is larger than the sum of its proper divisors (31342525).

213091907 is a wasteful number, since it uses less digits than its factorization.

213091907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112609.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 213091907 is about 14597.6678616826. The cubic root of 213091907 is about 597.2951458935.

The spelling of 213091907 in words is "two hundred thirteen million, ninety-one thousand, nine hundred seven".