191901313 has 8 divisors (see below), whose sum is σ = 194671080. Its totient is φ = 189148800.

The previous prime is 191901301. The next prime is 191901317. The reversal of 191901313 is 313109191.

It can be written as a sum of positive squares in 4 ways, for example, as 177635584 + 14265729 = 13328^2 + 3777^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191901313 is a prime.

It is a super-2 number, since 2×191901313² = 73652227862247938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191901317) 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, 18981 + ... + 27277.

It is an arithmetic number, because the mean of its divisors is an integer number (24333885).

Almost surely, 2^191901313 is an apocalyptic number.

It is an amenable number.

191901313 is a deficient number, since it is larger than the sum of its proper divisors (2769767).

191901313 is a wasteful number, since it uses less digits than its factorization.

191901313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8627.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 191901313 is about 13852.8449424658. The cubic root of 191901313 is about 576.8009700145.

It can be divided in two parts, 19190 and 1313, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 191901313 in words is "one hundred ninety-one million, nine hundred one thousand, three hundred thirteen".