997401691 has 8 divisors (see below), whose sum is σ = 1171772784. Its totient is φ = 836980320.

The previous prime is 997401649. The next prime is 997401707. The reversal of 997401691 is 196104799.

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

It is not a de Polignac number, because 997401691 - 2¹³ = 997393499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997401091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3487276 + ... + 3487561.

It is an arithmetic number, because the mean of its divisors is an integer number (146471598).

Almost surely, 2^997401691 is an apocalyptic number.

997401691 is a deficient number, since it is larger than the sum of its proper divisors (174371093).

997401691 is a wasteful number, since it uses less digits than its factorization.

997401691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6974861.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 997401691 is about 31581.6670079336. The cubic root of 997401691 is about 999.1331457809.

The spelling of 997401691 in words is "nine hundred ninety-seven million, four hundred one thousand, six hundred ninety-one".