815241901 has 2 divisors, whose sum is σ = 815241902. Its totient is φ = 815241900.

The previous prime is 815241893. The next prime is 815241929. The reversal of 815241901 is 109142518.

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., 810768676 + 4473225 = 28474^2 + 2115^2 .

It is a cyclic number.

It is not a de Polignac number, because 815241901 - 2³ = 815241893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815241941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407620950 + 407620951.

It is an arithmetic number, because the mean of its divisors is an integer number (407620951).

Almost surely, 2^815241901 is an apocalyptic number.

It is an amenable number.

815241901 is a deficient number, since it is larger than the sum of its proper divisors (1).

815241901 is an equidigital number, since it uses as much as digits as its factorization.

815241901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 815241901 is about 28552.4412441388. The cubic root of 815241901 is about 934.1762697544.

The spelling of 815241901 in words is "eight hundred fifteen million, two hundred forty-one thousand, nine hundred one".