213125779 has 4 divisors (see below), whose sum is σ = 214537360. Its totient is φ = 211714200.

The previous prime is 213125771. The next prime is 213125789. The reversal of 213125779 is 977521312.

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 213125779 - 2³ = 213125771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213125771) 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, 705564 + ... + 705865.

It is an arithmetic number, because the mean of its divisors is an integer number (53634340).

Almost surely, 2^213125779 is an apocalyptic number.

213125779 is a deficient number, since it is larger than the sum of its proper divisors (1411581).

213125779 is a wasteful number, since it uses less digits than its factorization.

213125779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411580.

The product of its digits is 26460, while the sum is 37.

The square root of 213125779 is about 14598.8280009047. The cubic root of 213125779 is about 597.3267918776.

The spelling of 213125779 in words is "two hundred thirteen million, one hundred twenty-five thousand, seven hundred seventy-nine".