921898469 has 4 divisors (see below), whose sum is σ = 922354860. Its totient is φ = 921442080.

The previous prime is 921898463. The next prime is 921898477. The reversal of 921898469 is 964898129.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 853224100 + 68674369 = 29210^2 + 8287^2 .

It is a cyclic number.

It is not a de Polignac number, because 921898469 - 2¹² = 921894373 is a prime.

It is a super-2 number, since 2×921898469² = 1699793574289087922, 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 (921898463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225152 + ... + 229209.

It is an arithmetic number, because the mean of its divisors is an integer number (230588715).

Almost surely, 2^921898469 is an apocalyptic number.

It is an amenable number.

921898469 is a deficient number, since it is larger than the sum of its proper divisors (456391).

921898469 is a wasteful number, since it uses less digits than its factorization.

921898469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456390.

The product of its digits is 2239488, while the sum is 56.

The square root of 921898469 is about 30362.7809826439. The cubic root of 921898469 is about 973.2573628571.

The spelling of 921898469 in words is "nine hundred twenty-one million, eight hundred ninety-eight thousand, four hundred sixty-nine".