740721491 has 2 divisors, whose sum is σ = 740721492. Its totient is φ = 740721490.

The previous prime is 740721473. The next prime is 740721503. The reversal of 740721491 is 194127047.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 740721491 - 2⁶ = 740721427 is a prime.

It is not a weakly prime, because it can be changed into another prime (740721791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370360745 + 370360746.

It is an arithmetic number, because the mean of its divisors is an integer number (370360746).

Almost surely, 2^740721491 is an apocalyptic number.

740721491 is a deficient number, since it is larger than the sum of its proper divisors (1).

740721491 is an equidigital number, since it uses as much as digits as its factorization.

740721491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 740721491 is about 27216.1990549746. The cubic root of 740721491 is about 904.7980343551.

The spelling of 740721491 in words is "seven hundred forty million, seven hundred twenty-one thousand, four hundred ninety-one".