997794851 has 4 divisors (see below), whose sum is σ = 1032201600. Its totient is φ = 963388104.

The previous prime is 997794827. The next prime is 997794869. The reversal of 997794851 is 158497799.

997794851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158497799 = 751 ⋅211049.

It is a cyclic number.

It is not a de Polignac number, because 997794851 - 2¹⁸ = 997532707 is a prime.

It is a super-2 number, since 2×997794851² = 1991189129364224402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997794871) 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, 17203331 + ... + 17203388.

It is an arithmetic number, because the mean of its divisors is an integer number (258050400).

Almost surely, 2^997794851 is an apocalyptic number.

997794851 is a deficient number, since it is larger than the sum of its proper divisors (34406749).

997794851 is a wasteful number, since it uses less digits than its factorization.

997794851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34406748.

The product of its digits is 5715360, while the sum is 59.

The square root of 997794851 is about 31587.8908919225. The cubic root of 997794851 is about 999.2644093724.

The spelling of 997794851 in words is "nine hundred ninety-seven million, seven hundred ninety-four thousand, eight hundred fifty-one".