213735528531 has 24 divisors (see below), whose sum is σ = 364999920480. Its totient is φ = 117923049216.

The previous prime is 213735528509. The next prime is 213735528551. The reversal of 213735528531 is 135825537312.

213735528531 is a `hidden beast` number, since 2 + 1 + 3 + 73 + 5 + 528 + 53 + 1 = 666.

It is not a de Polignac number, because 213735528531 - 2¹⁰ = 213735527507 is a prime.

It is a super-2 number, since 2×213735528531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213735528551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58491750 + ... + 58495403.

It is an arithmetic number, because the mean of its divisors is an integer number (15208330020).

Almost surely, 2^213735528531 is an apocalyptic number.

213735528531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

213735528531 is a deficient number, since it is larger than the sum of its proper divisors (151264391949).

213735528531 is a wasteful number, since it uses less digits than its factorization.

213735528531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116987195 (or 116987192 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The spelling of 213735528531 in words is "two hundred thirteen billion, seven hundred thirty-five million, five hundred twenty-eight thousand, five hundred thirty-one".