891699397 has 8 divisors (see below), whose sum is σ = 931550976. Its totient is φ = 851938032.

The previous prime is 891699383. The next prime is 891699427. The reversal of 891699397 is 793996198.

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

It is not a de Polignac number, because 891699397 - 2⁷ = 891699269 is a prime.

It is a super-2 number, since 2×891699397² = 1590255629220327218, 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 (891699377) 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, 1933 + ... + 42274.

It is an arithmetic number, because the mean of its divisors is an integer number (116443872).

Almost surely, 2^891699397 is an apocalyptic number.

It is an amenable number.

891699397 is a deficient number, since it is larger than the sum of its proper divisors (39851579).

891699397 is a wasteful number, since it uses less digits than its factorization.

891699397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45107.

The product of its digits is 6613488, while the sum is 61.

The square root of 891699397 is about 29861.3361556378. The cubic root of 891699397 is about 962.5120109144.

The spelling of 891699397 in words is "eight hundred ninety-one million, six hundred ninety-nine thousand, three hundred ninety-seven".