8150921 has 2 divisors, whose sum is σ = 8150922. Its totient is φ = 8150920.

The previous prime is 8150903. The next prime is 8150929. The reversal of 8150921 is 1290518.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7639696 + 511225 = 2764^2 + 715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8150921 is a prime.

It is not a weakly prime, because it can be changed into another prime (8150929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4075460 + 4075461.

It is an arithmetic number, because the mean of its divisors is an integer number (4075461).

Almost surely, 2^8150921 is an apocalyptic number.

It is an amenable number.

8150921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8150921 is an equidigital number, since it uses as much as digits as its factorization.

8150921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 8150921 is about 2854.9817862817. The cubic root of 8150921 is about 201.2498481282.

The spelling of 8150921 in words is "eight million, one hundred fifty thousand, nine hundred twenty-one".