81151630 has 32 divisors (see below), whose sum is σ = 167256576. Its totient is φ = 27770784.

The previous prime is 81151627. The next prime is 81151633. The reversal of 81151630 is 3615118.

It is an interprime number because it is at equal distance from previous prime (81151627) and next prime (81151633).

It is a junction number, because it is equal to n+sod(n) for n = 81151595 and 81151604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81151633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61437 + ... + 62743.

It is an arithmetic number, because the mean of its divisors is an integer number (5226768).

Almost surely, 2^81151630 is an apocalyptic number.

81151630 is an abundant number, since it is smaller than the sum of its proper divisors (86104946).

81151630 is a wasteful number, since it uses less digits than its factorization.

81151630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 81151630 is about 9008.4199502465. The cubic root of 81151630 is about 432.9446883569.

Adding to 81151630 its reverse (3615118), we get a palindrome (84766748).

It can be divided in two parts, 811 and 51630, that added together give a square (52441 = 229²).

The spelling of 81151630 in words is "eighty-one million, one hundred fifty-one thousand, six hundred thirty".