81519030 has 24 divisors (see below), whose sum is σ = 211949712. Its totient is φ = 21738384.

The previous prime is 81519007. The next prime is 81519037. The reversal of 81519030 is 3091518.

It is a junction number, because it is equal to n+sod(n) for n = 81518985 and 81519003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81519037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 452794 + ... + 452973.

It is an arithmetic number, because the mean of its divisors is an integer number (8831238).

Almost surely, 2^81519030 is an apocalyptic number.

81519030 is an abundant number, since it is smaller than the sum of its proper divisors (130430682).

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

81519030 is a wasteful number, since it uses less digits than its factorization.

81519030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905780 (or 905777 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 81519030 is about 9028.7889553361. The cubic root of 81519030 is about 433.5970656235.

The spelling of 81519030 in words is "eighty-one million, five hundred nineteen thousand, thirty".