81202213 has 16 divisors (see below), whose sum is σ = 86501376. Its totient is φ = 76071600.

The previous prime is 81202171. The next prime is 81202243. The reversal of 81202213 is 31220218.

It is a cyclic number.

It is not a de Polignac number, because 81202213 - 2¹⁷ = 81071141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81202243) 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, 357606 + ... + 357832.

It is an arithmetic number, because the mean of its divisors is an integer number (5406336).

Almost surely, 2^81202213 is an apocalyptic number.

It is an amenable number.

81202213 is a deficient number, since it is larger than the sum of its proper divisors (5299163).

81202213 is a wasteful number, since it uses less digits than its factorization.

81202213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 81202213 is about 9011.2270529601. The cubic root of 81202213 is about 433.0346232628.

The spelling of 81202213 in words is "eighty-one million, two hundred two thousand, two hundred thirteen".