997771397 has 8 divisors (see below), whose sum is σ = 1140666816. Its totient is φ = 854965152.

The previous prime is 997771381. The next prime is 997771409. The reversal of 997771397 is 793177799.

997771397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 997771397 - 2⁴ = 997771381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997771337) 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, 3713 + ... + 44825.

It is an arithmetic number, because the mean of its divisors is an integer number (142583352).

Almost surely, 2^997771397 is an apocalyptic number.

It is an amenable number.

997771397 is a deficient number, since it is larger than the sum of its proper divisors (142895419).

997771397 is a wasteful number, since it uses less digits than its factorization.

997771397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44587.

The product of its digits is 5250987, while the sum is 59.

The square root of 997771397 is about 31587.5196398831. The cubic root of 997771397 is about 999.2565797967.

Adding to 997771397 its sum of digits (59), we get a triangular number (997771456 = T₄₄₆₇₁).

The spelling of 997771397 in words is "nine hundred ninety-seven million, seven hundred seventy-one thousand, three hundred ninety-seven".