891155940397 has 8 divisors (see below), whose sum is σ = 916677891360. Its totient is φ = 865986016560.

The previous prime is 891155940349. The next prime is 891155940401. The reversal of 891155940397 is 793049551198.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891155940397 is a prime.

It is a super-2 number, since 2×891155940397² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891150940397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88001647 + ... + 88011772.

It is an arithmetic number, because the mean of its divisors is an integer number (114584736420).

Almost surely, 2^891155940397 is an apocalyptic number.

It is an amenable number.

891155940397 is a deficient number, since it is larger than the sum of its proper divisors (25521950963).

891155940397 is a wasteful number, since it uses less digits than its factorization.

891155940397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176013563.

The product of its (nonzero) digits is 12247200, while the sum is 61.

The spelling of 891155940397 in words is "eight hundred ninety-one billion, one hundred fifty-five million, nine hundred forty thousand, three hundred ninety-seven".