212749819 has 2 divisors, whose sum is σ = 212749820. Its totient is φ = 212749818.

The previous prime is 212749763. The next prime is 212749837. The reversal of 212749819 is 918947212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212749819 - 2²³ = 204361211 is a prime.

It is a super-2 number, since 2×212749819² = 90524970969065522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212749879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106374909 + 106374910.

It is an arithmetic number, because the mean of its divisors is an integer number (106374910).

Almost surely, 2^212749819 is an apocalyptic number.

212749819 is a deficient number, since it is larger than the sum of its proper divisors (1).

212749819 is an equidigital number, since it uses as much as digits as its factorization.

212749819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 212749819 is about 14585.9459412134. The cubic root of 212749819 is about 596.9753512695.

The spelling of 212749819 in words is "two hundred twelve million, seven hundred forty-nine thousand, eight hundred nineteen".