81630106 has 4 divisors (see below), whose sum is σ = 122445162. Its totient is φ = 40815052.

The previous prime is 81630091. The next prime is 81630121. The reversal of 81630106 is 60103618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60103618 = 2 ⋅30051809.

It is an interprime number because it is at equal distance from previous prime (81630091) and next prime (81630121).

It can be written as a sum of positive squares in only one way, i.e., 50993881 + 30636225 = 7141^2 + 5535^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20407525 + ... + 20407528.

Almost surely, 2^81630106 is an apocalyptic number.

81630106 is a deficient number, since it is larger than the sum of its proper divisors (40815056).

81630106 is a wasteful number, since it uses less digits than its factorization.

81630106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40815055.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 81630106 is about 9034.9380739438. The cubic root of 81630106 is about 433.7939127862.

The spelling of 81630106 in words is "eighty-one million, six hundred thirty thousand, one hundred six".