91478953 has 2 divisors, whose sum is σ = 91478954. Its totient is φ = 91478952.

The previous prime is 91478951. The next prime is 91478983. The reversal of 91478953 is 35987419.

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., 66797929 + 24681024 = 8173^2 + 4968^2 .

It is a cyclic number.

It is not a de Polignac number, because 91478953 - 2¹ = 91478951 is a prime.

Together with 91478951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91478951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45739476 + 45739477.

It is an arithmetic number, because the mean of its divisors is an integer number (45739477).

Almost surely, 2^91478953 is an apocalyptic number.

It is an amenable number.

91478953 is a deficient number, since it is larger than the sum of its proper divisors (1).

91478953 is an equidigital number, since it uses as much as digits as its factorization.

91478953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 91478953 is about 9564.4630272692. The cubic root of 91478953 is about 450.5818859338.

The spelling of 91478953 in words is "ninety-one million, four hundred seventy-eight thousand, nine hundred fifty-three".