749891381 has 2 divisors, whose sum is σ = 749891382. Its totient is φ = 749891380.

The previous prime is 749891377. The next prime is 749891431. The reversal of 749891381 is 183198947.

It is an a-pointer prime, because the next prime (749891431) can be obtained adding 749891381 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 653262481 + 96628900 = 25559^2 + 9830^2 .

It is a cyclic number.

It is not a de Polignac number, because 749891381 - 2² = 749891377 is a prime.

It is a super-2 number, since 2×749891381² = 1124674166596174322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (749891341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374945690 + 374945691.

It is an arithmetic number, because the mean of its divisors is an integer number (374945691).

Almost surely, 2^749891381 is an apocalyptic number.

It is an amenable number.

749891381 is a deficient number, since it is larger than the sum of its proper divisors (1).

749891381 is an equidigital number, since it uses as much as digits as its factorization.

749891381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 50.

The square root of 749891381 is about 27384.1447009031. The cubic root of 749891381 is about 908.5164334493.

The spelling of 749891381 in words is "seven hundred forty-nine million, eight hundred ninety-one thousand, three hundred eighty-one".