1791974861 has 8 divisors (see below), whose sum is σ = 1861088760. Its totient is φ = 1723949568.

The previous prime is 1791974851. The next prime is 1791974881. The reversal of 1791974861 is 1684791971.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 628755625 + 1163219236 = 25075^2 + 34106^2 .

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 1791974861 - 2²⁶ = 1724865997 is a prime.

It is a super-2 number, since 2×1791974861² = 6422347804911938642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1791974801) 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, 268796 + ... + 275381.

It is an arithmetic number, because the mean of its divisors is an integer number (232636095).

Almost surely, 2^1791974861 is an apocalyptic number.

It is an amenable number.

1791974861 is a deficient number, since it is larger than the sum of its proper divisors (69113899).

1791974861 is an equidigital number, since it uses as much as digits as its factorization.

1791974861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544303.

The product of its digits is 762048, while the sum is 53.

The square root of 1791974861 is about 42331.7240494644. The cubic root of 1791974861 is about 1214.6299089015.

The spelling of 1791974861 in words is "one billion, seven hundred ninety-one million, nine hundred seventy-four thousand, eight hundred sixty-one".