212057531 has 4 divisors (see below), whose sum is σ = 242351472. Its totient is φ = 181763592.

The previous prime is 212057519. The next prime is 212057551. The reversal of 212057531 is 135750212.

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

It is a cyclic number.

It is not a de Polignac number, because 212057531 - 2¹⁸ = 211795387 is a prime.

It is a super-2 number, since 2×212057531² = 89936792907631922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212057531.

It is not an unprimeable number, because it can be changed into a prime (212057551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15146960 + ... + 15146973.

It is an arithmetic number, because the mean of its divisors is an integer number (60587868).

Almost surely, 2^212057531 is an apocalyptic number.

212057531 is a deficient number, since it is larger than the sum of its proper divisors (30293941).

212057531 is an equidigital number, since it uses as much as digits as its factorization.

212057531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30293940.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 212057531 is about 14562.1952671979. The cubic root of 212057531 is about 596.3271283068.

The spelling of 212057531 in words is "two hundred twelve million, fifty-seven thousand, five hundred thirty-one".