81495949 has 2 divisors, whose sum is σ = 81495950. Its totient is φ = 81495948.

The previous prime is 81495937. The next prime is 81495961. The reversal of 81495949 is 94959418.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (81495937) and next prime (81495961).

It can be written as a sum of positive squares in only one way, i.e., 61308900 + 20187049 = 7830^2 + 4493^2 .

It is a cyclic number.

It is not a de Polignac number, because 81495949 - 2⁹ = 81495437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81495989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40747974 + 40747975.

It is an arithmetic number, because the mean of its divisors is an integer number (40747975).

Almost surely, 2^81495949 is an apocalyptic number.

It is an amenable number.

81495949 is a deficient number, since it is larger than the sum of its proper divisors (1).

81495949 is an equidigital number, since it uses as much as digits as its factorization.

81495949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 49.

The square root of 81495949 is about 9027.5106757068. The cubic root of 81495949 is about 433.5561393983.

The spelling of 81495949 in words is "eighty-one million, four hundred ninety-five thousand, nine hundred forty-nine".