191581002 has 12 divisors (see below), whose sum is σ = 415092210. Its totient is φ = 63860328.

The previous prime is 191581001. The next prime is 191581031. The reversal of 191581002 is 200185191.

It can be written as a sum of positive squares in only one way, i.e., 175589001 + 15992001 = 13251^2 + 3999^2 .

It is not an unprimeable number, because it can be changed into a prime (191581001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5321677 + ... + 5321712.

Almost surely, 2^191581002 is an apocalyptic number.

191581002 is an abundant number, since it is smaller than the sum of its proper divisors (223511208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191581002 is a wasteful number, since it uses less digits than its factorization.

191581002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10643397 (or 10643394 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 191581002 is about 13841.2789148980. The cubic root of 191581002 is about 576.4798699263.

The spelling of 191581002 in words is "one hundred ninety-one million, five hundred eighty-one thousand, two".