738120781 has 2 divisors, whose sum is σ = 738120782. Its totient is φ = 738120780.

The previous prime is 738120749. The next prime is 738120793. The reversal of 738120781 is 187021837.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672364900 + 65755881 = 25930^2 + 8109^2 .

It is an emirp because it is prime and its reverse (187021837) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 738120781 - 2⁵ = 738120749 is a prime.

It is a super-2 number, since 2×738120781² = 1089644574688099922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 738120781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (738120701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 369060390 + 369060391.

It is an arithmetic number, because the mean of its divisors is an integer number (369060391).

Almost surely, 2^738120781 is an apocalyptic number.

It is an amenable number.

738120781 is a deficient number, since it is larger than the sum of its proper divisors (1).

738120781 is an equidigital number, since it uses as much as digits as its factorization.

738120781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 738120781 is about 27168.3783284906. The cubic root of 738120781 is about 903.7378623113.

The spelling of 738120781 in words is "seven hundred thirty-eight million, one hundred twenty thousand, seven hundred eighty-one".