8115493021 has 2 divisors, whose sum is σ = 8115493022. Its totient is φ = 8115493020.

The previous prime is 8115492991. The next prime is 8115493027. The reversal of 8115493021 is 1203945118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8115487396 + 5625 = 90086^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 8115493021 - 2⁵ = 8115492989 is a prime.

It is a super-2 number, since 2×8115493021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8115493027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4057746510 + 4057746511.

It is an arithmetic number, because the mean of its divisors is an integer number (4057746511).

Almost surely, 2^8115493021 is an apocalyptic number.

It is an amenable number.

8115493021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8115493021 is an equidigital number, since it uses as much as digits as its factorization.

8115493021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 8115493021 is about 90086.0312201620. The cubic root of 8115493021 is about 2009.5784716242.

The spelling of 8115493021 in words is "eight billion, one hundred fifteen million, four hundred ninety-three thousand, twenty-one".