747647749 has 2 divisors, whose sum is σ = 747647750. Its totient is φ = 747647748.

The previous prime is 747647717. The next prime is 747647767. The reversal of 747647749 is 947746747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 747639649 + 8100 = 27343^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 747647749 - 2⁵ = 747647717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 747647749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (747647249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 373823874 + 373823875.

It is an arithmetic number, because the mean of its divisors is an integer number (373823875).

Almost surely, 2^747647749 is an apocalyptic number.

It is an amenable number.

747647749 is a deficient number, since it is larger than the sum of its proper divisors (1).

747647749 is an equidigital number, since it uses as much as digits as its factorization.

747647749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8297856, while the sum is 55.

The square root of 747647749 is about 27343.1481179472. The cubic root of 747647749 is about 907.6094519485.

It can be divided in two parts, 7476 and 47749, that added together give a square (55225 = 235²).

The spelling of 747647749 in words is "seven hundred forty-seven million, six hundred forty-seven thousand, seven hundred forty-nine".