91241666 has 4 divisors (see below), whose sum is σ = 136862502. Its totient is φ = 45620832.

The previous prime is 91241663. The next prime is 91241677. The reversal of 91241666 is 66614219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66614219 = 7 ⋅9516317.

It can be written as a sum of positive squares in only one way, i.e., 48011041 + 43230625 = 6929^2 + 6575^2 .

It is a super-2 number, since 2×91241666² = 16650083228911112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91241663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22810415 + ... + 22810418.

Almost surely, 2^91241666 is an apocalyptic number.

91241666 is a deficient number, since it is larger than the sum of its proper divisors (45620836).

91241666 is a wasteful number, since it uses less digits than its factorization.

91241666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45620835.

The product of its digits is 15552, while the sum is 35.

The square root of 91241666 is about 9552.0503558137. The cubic root of 91241666 is about 450.1919609001.

The spelling of 91241666 in words is "ninety-one million, two hundred forty-one thousand, six hundred sixty-six".