915440081 has 2 divisors, whose sum is σ = 915440082. Its totient is φ = 915440080.

The previous prime is 915440041. The next prime is 915440107. The reversal of 915440081 is 180044519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 827080081 + 88360000 = 28759^2 + 9400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-915440081 is a prime.

It is a super-2 number, since 2×915440081² = 1676061083802573122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (915440041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 457720040 + 457720041.

It is an arithmetic number, because the mean of its divisors is an integer number (457720041).

Almost surely, 2^915440081 is an apocalyptic number.

It is an amenable number.

915440081 is a deficient number, since it is larger than the sum of its proper divisors (1).

915440081 is an equidigital number, since it uses as much as digits as its factorization.

915440081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 915440081 is about 30256.2403645926. The cubic root of 915440081 is about 970.9793067805.

The spelling of 915440081 in words is "nine hundred fifteen million, four hundred forty thousand, eighty-one".