890948921 has 4 divisors (see below), whose sum is σ = 907759332. Its totient is φ = 874138512.

The previous prime is 890948917. The next prime is 890948923. The reversal of 890948921 is 129849098.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129849098 = 2 ⋅64924549.

It can be written as a sum of positive squares in 2 ways, for example, as 536154025 + 354794896 = 23155^2 + 18836^2 .

It is a cyclic number.

It is not a de Polignac number, because 890948921 - 2² = 890948917 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 890948921.

It is not an unprimeable number, because it can be changed into a prime (890948923) 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, 8405126 + ... + 8405231.

It is an arithmetic number, because the mean of its divisors is an integer number (226939833).

Almost surely, 2^890948921 is an apocalyptic number.

It is an amenable number.

890948921 is a deficient number, since it is larger than the sum of its proper divisors (16810411).

890948921 is a wasteful number, since it uses less digits than its factorization.

890948921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16810410.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 890948921 is about 29848.7674954930. The cubic root of 890948921 is about 962.2419105838.

The spelling of 890948921 in words is "eight hundred ninety million, nine hundred forty-eight thousand, nine hundred twenty-one".