81416213 has 6 divisors (see below), whose sum is σ = 86487426. Its totient is φ = 76626752.

The previous prime is 81416207. The next prime is 81416219. The reversal of 81416213 is 31261418.

It is an interprime number because it is at equal distance from previous prime (81416207) and next prime (81416219).

It can be written as a sum of positive squares in 3 ways, for example, as 53611684 + 27804529 = 7322^2 + 5273^2 .

It is not a de Polignac number, because 81416213 - 2¹⁰ = 81415189 is a prime.

It is a super-2 number, since 2×81416213² = 13257199478522738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81416219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140570 + ... + 141147.

It is an arithmetic number, because the mean of its divisors is an integer number (14414571).

Almost surely, 2^81416213 is an apocalyptic number.

It is an amenable number.

81416213 is a deficient number, since it is larger than the sum of its proper divisors (5071213).

81416213 is a wasteful number, since it uses less digits than its factorization.

81416213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281751 (or 281734 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 81416213 is about 9023.0933165960. The cubic root of 81416213 is about 433.4146955050.

The spelling of 81416213 in words is "eighty-one million, four hundred sixteen thousand, two hundred thirteen".