917484721 has 2 divisors, whose sum is σ = 917484722. Its totient is φ = 917484720.

The previous prime is 917484691. The next prime is 917484731. The reversal of 917484721 is 127484719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 915909696 + 1575025 = 30264^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 917484721 - 2⁹ = 917484209 is a prime.

It is not a weakly prime, because it can be changed into another prime (917484731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 458742360 + 458742361.

It is an arithmetic number, because the mean of its divisors is an integer number (458742361).

Almost surely, 2^917484721 is an apocalyptic number.

It is an amenable number.

917484721 is a deficient number, since it is larger than the sum of its proper divisors (1).

917484721 is an equidigital number, since it uses as much as digits as its factorization.

917484721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 43.

The square root of 917484721 is about 30290.0102509062. The cubic root of 917484721 is about 971.7016649631.

It can be divided in two parts, 91748 and 4721, that added together give a palindrome (96469).

The spelling of 917484721 in words is "nine hundred seventeen million, four hundred eighty-four thousand, seven hundred twenty-one".