215542042531 has 16 divisors (see below), whose sum is σ = 217871769600. Its totient is φ = 213227840448.

The previous prime is 215542042501. The next prime is 215542042559. The reversal of 215542042531 is 135240245512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 215542042531 - 2²⁵ = 215508488099 is a prime.

It is a super-2 number, since 2×215542042531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215542042501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28035970 + ... + 28043656.

It is an arithmetic number, because the mean of its divisors is an integer number (13616985600).

Almost surely, 2^215542042531 is an apocalyptic number.

215542042531 is a deficient number, since it is larger than the sum of its proper divisors (2329727069).

215542042531 is a wasteful number, since it uses less digits than its factorization.

215542042531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8658.

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 215542042531 in words is "two hundred fifteen billion, five hundred forty-two million, forty-two thousand, five hundred thirty-one".