815191530 has 32 divisors (see below), whose sum is σ = 2041524864. Its totient is φ = 207932736.

The previous prime is 815191483. The next prime is 815191579. The reversal of 815191530 is 35191518.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 815191491 and 815191500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590029 + ... + 591408.

It is an arithmetic number, because the mean of its divisors is an integer number (63797652).

Almost surely, 2^815191530 is an apocalyptic number.

815191530 is an abundant number, since it is smaller than the sum of its proper divisors (1226333334).

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

815191530 is a wasteful number, since it uses less digits than its factorization.

815191530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181470.

The product of its (nonzero) digits is 5400, while the sum is 33.

The square root of 815191530 is about 28551.5591518222. The cubic root of 815191530 is about 934.1570295092.

It can be divided in two parts, 8151 and 91530, that added together give a triangular number (99681 = T₄₄₆).

The spelling of 815191530 in words is "eight hundred fifteen million, one hundred ninety-one thousand, five hundred thirty".