216026749 has 2 divisors, whose sum is σ = 216026750. Its totient is φ = 216026748.

The previous prime is 216026737. The next prime is 216026807. The reversal of 216026749 is 947620612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111619225 + 104407524 = 10565^2 + 10218^2 .

It is a cyclic number.

It is not a de Polignac number, because 216026749 - 2⁷ = 216026621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216026549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108013374 + 108013375.

It is an arithmetic number, because the mean of its divisors is an integer number (108013375).

Almost surely, 2^216026749 is an apocalyptic number.

It is an amenable number.

216026749 is a deficient number, since it is larger than the sum of its proper divisors (1).

216026749 is an equidigital number, since it uses as much as digits as its factorization.

216026749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 216026749 is about 14697.8484479872. The cubic root of 216026749 is about 600.0247665703.

The spelling of 216026749 in words is "two hundred sixteen million, twenty-six thousand, seven hundred forty-nine".