213791651 has 4 divisors (see below), whose sum is σ = 215352312. Its totient is φ = 212230992.

The previous prime is 213791603. The next prime is 213791659. The reversal of 213791651 is 156197312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213791651 - 2¹⁴ = 213775267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213791659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780125 + ... + 780398.

It is an arithmetic number, because the mean of its divisors is an integer number (53838078).

Almost surely, 2^213791651 is an apocalyptic number.

213791651 is a deficient number, since it is larger than the sum of its proper divisors (1560661).

213791651 is a wasteful number, since it uses less digits than its factorization.

213791651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560660.

The product of its digits is 11340, while the sum is 35.

The square root of 213791651 is about 14621.6158819742. The cubic root of 213791651 is about 597.9482240979.

The spelling of 213791651 in words is "two hundred thirteen million, seven hundred ninety-one thousand, six hundred fifty-one".