891425497 has 8 divisors (see below), whose sum is σ = 932794056. Its totient is φ = 850966272.

The previous prime is 891425449. The next prime is 891425537. The reversal of 891425497 is 794524198.

It can be written as a sum of positive squares in 4 ways, for example, as 186841561 + 704583936 = 13669^2 + 26544^2 .

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 891425497 - 2⁷ = 891425369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 891425497.

It is not an unprimeable number, because it can be changed into a prime (891425407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225328 + ... + 229249.

It is an arithmetic number, because the mean of its divisors is an integer number (116599257).

Almost surely, 2^891425497 is an apocalyptic number.

It is an amenable number.

891425497 is a deficient number, since it is larger than the sum of its proper divisors (41368559).

891425497 is a wasteful number, since it uses less digits than its factorization.

891425497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454667.

The product of its digits is 725760, while the sum is 49.

The square root of 891425497 is about 29856.7496054075. The cubic root of 891425497 is about 962.4134504061.

The spelling of 891425497 in words is "eight hundred ninety-one million, four hundred twenty-five thousand, four hundred ninety-seven".