215525142 has 24 divisors (see below), whose sum is σ = 533681616. Its totient is φ = 61578576.

The previous prime is 215525137. The next prime is 215525143. The reversal of 215525142 is 241525512.

215525142 is a `hidden beast` number, since 21 + 552 + 51 + 42 = 666.

215525142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215525143) 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, 855133 + ... + 855384.

It is an arithmetic number, because the mean of its divisors is an integer number (22236734).

Almost surely, 2^215525142 is an apocalyptic number.

215525142 is an abundant number, since it is smaller than the sum of its proper divisors (318156474).

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

215525142 is a wasteful number, since it uses less digits than its factorization.

215525142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710532 (or 1710529 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 215525142 is about 14680.7745708460. The cubic root of 215525142 is about 599.5599940702.

The spelling of 215525142 in words is "two hundred fifteen million, five hundred twenty-five thousand, one hundred forty-two".