749897189021 has 2 divisors, whose sum is σ = 749897189022. Its totient is φ = 749897189020.

The previous prime is 749897188991. The next prime is 749897189023. The reversal of 749897189021 is 120981798947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409612800100 + 340284388921 = 640010^2 + 583339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-749897189021 is a prime.

Together with 749897189023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (749897189023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374948594510 + 374948594511.

It is an arithmetic number, because the mean of its divisors is an integer number (374948594511).

Almost surely, 2^749897189021 is an apocalyptic number.

It is an amenable number.

749897189021 is a deficient number, since it is larger than the sum of its proper divisors (1).

749897189021 is an equidigital number, since it uses as much as digits as its factorization.

749897189021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18289152, while the sum is 65.

The spelling of 749897189021 in words is "seven hundred forty-nine billion, eight hundred ninety-seven million, one hundred eighty-nine thousand, twenty-one".