861525142 has 4 divisors (see below), whose sum is σ = 1292287716. Its totient is φ = 430762570.

The previous prime is 861525109. The next prime is 861525157. The reversal of 861525142 is 241525168.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 861525098 and 861525107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215381284 + ... + 215381287.

It is an arithmetic number, because the mean of its divisors is an integer number (323071929).

Almost surely, 2^861525142 is an apocalyptic number.

861525142 is a deficient number, since it is larger than the sum of its proper divisors (430762574).

861525142 is a wasteful number, since it uses less digits than its factorization.

861525142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430762573.

The product of its digits is 19200, while the sum is 34.

The square root of 861525142 is about 29351.7485339460. The cubic root of 861525142 is about 951.5303651582.

The spelling of 861525142 in words is "eight hundred sixty-one million, five hundred twenty-five thousand, one hundred forty-two".