891097469 has 2 divisors, whose sum is σ = 891097470. Its totient is φ = 891097468.

The previous prime is 891097453. The next prime is 891097553. The reversal of 891097469 is 964790198.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 868009444 + 23088025 = 29462^2 + 4805^2 .

It is a cyclic number.

It is not a de Polignac number, because 891097469 - 2⁴ = 891097453 is a prime.

It is a super-2 number, since 2×891097469² = 1588109398516411922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 891097469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891097409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445548734 + 445548735.

It is an arithmetic number, because the mean of its divisors is an integer number (445548735).

Almost surely, 2^891097469 is an apocalyptic number.

It is an amenable number.

891097469 is a deficient number, since it is larger than the sum of its proper divisors (1).

891097469 is an equidigital number, since it uses as much as digits as its factorization.

891097469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 891097469 is about 29851.2557357308. The cubic root of 891097469 is about 962.2953858410.

The spelling of 891097469 in words is "eight hundred ninety-one million, ninety-seven thousand, four hundred sixty-nine".