748621591 has 2 divisors, whose sum is σ = 748621592. Its totient is φ = 748621590.

The previous prime is 748621579. The next prime is 748621651. The reversal of 748621591 is 195126847.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 748621591 - 2¹⁵ = 748588823 is a prime.

It is a super-2 number, since 2×748621591² = 1120868573022742562, which contains 22 as substring.

It is equal to p_38635756 and since 748621591 and 38635756 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (748621691) 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, 374310795 + 374310796.

It is an arithmetic number, because the mean of its divisors is an integer number (374310796).

Almost surely, 2^748621591 is an apocalyptic number.

748621591 is a deficient number, since it is larger than the sum of its proper divisors (1).

748621591 is an equidigital number, since it uses as much as digits as its factorization.

748621591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 748621591 is about 27360.9501114271. The cubic root of 748621591 is about 908.0033472128.

The spelling of 748621591 in words is "seven hundred forty-eight million, six hundred twenty-one thousand, five hundred ninety-one".