87212311 has 2 divisors, whose sum is σ = 87212312. Its totient is φ = 87212310.

The previous prime is 87212303. The next prime is 87212339. The reversal of 87212311 is 11321278.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87212311 - 2³ = 87212303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87212341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43606155 + 43606156.

It is an arithmetic number, because the mean of its divisors is an integer number (43606156).

Almost surely, 2^87212311 is an apocalyptic number.

87212311 is a deficient number, since it is larger than the sum of its proper divisors (1).

87212311 is an equidigital number, since it uses as much as digits as its factorization.

87212311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 25.

The square root of 87212311 is about 9338.7531823044. The cubic root of 87212311 is about 443.4649138644.

Adding to 87212311 its reverse (11321278), we get a palindrome (98533589).

The spelling of 87212311 in words is "eighty-seven million, two hundred twelve thousand, three hundred eleven".