81434150 has 24 divisors (see below), whose sum is σ = 173106480. Its totient is φ = 27920160.

The previous prime is 81434147. The next prime is 81434153. The reversal of 81434150 is 5143418.

It is an interprime number because it is at equal distance from previous prime (81434147) and next prime (81434153).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81434153) 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 11 ways as a sum of consecutive naturals, for example, 115985 + ... + 116684.

It is an arithmetic number, because the mean of its divisors is an integer number (7212770).

Almost surely, 2^81434150 is an apocalyptic number.

81434150 is an abundant number, since it is smaller than the sum of its proper divisors (91672330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81434150 is a wasteful number, since it uses less digits than its factorization.

81434150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232688 (or 232683 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 81434150 is about 9024.0872114580. The cubic root of 81434150 is about 433.4465220428.

Adding to 81434150 its reverse (5143418), we get a palindrome (86577568).

The spelling of 81434150 in words is "eighty-one million, four hundred thirty-four thousand, one hundred fifty".