823150121 has 2 divisors, whose sum is σ = 823150122. Its totient is φ = 823150120.

The previous prime is 823150103. The next prime is 823150127. The reversal of 823150121 is 121051328.

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., 821624896 + 1525225 = 28664^2 + 1235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-823150121 is a prime.

It is a super-2 number, since 2×823150121² = 1355152243404629282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (823150127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411575060 + 411575061.

It is an arithmetic number, because the mean of its divisors is an integer number (411575061).

Almost surely, 2^823150121 is an apocalyptic number.

It is an amenable number.

823150121 is a deficient number, since it is larger than the sum of its proper divisors (1).

823150121 is an equidigital number, since it uses as much as digits as its factorization.

823150121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 823150121 is about 28690.5929008098. The cubic root of 823150121 is about 937.1872007950.

The spelling of 823150121 in words is "eight hundred twenty-three million, one hundred fifty thousand, one hundred twenty-one".