191020013 has 8 divisors (see below), whose sum is σ = 198636600. Its totient is φ = 183472128.

The previous prime is 191020009. The next prime is 191020073. The reversal of 191020013 is 310020191.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 635209 + 190384804 = 797^2 + 13798^2 .

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 191020013 - 2² = 191020009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191019973 and 191020000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191020073) 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, 11468 + ... + 22661.

It is an arithmetic number, because the mean of its divisors is an integer number (24829575).

Almost surely, 2^191020013 is an apocalyptic number.

It is an amenable number.

191020013 is a deficient number, since it is larger than the sum of its proper divisors (7616587).

191020013 is a wasteful number, since it uses less digits than its factorization.

191020013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34351.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 191020013 is about 13820.9989870487. The cubic root of 191020013 is about 575.9166355127.

The spelling of 191020013 in words is "one hundred ninety-one million, twenty thousand, thirteen".