774042991 has 2 divisors, whose sum is σ = 774042992. Its totient is φ = 774042990.

The previous prime is 774042967. The next prime is 774043019. The reversal of 774042991 is 199240477.

It is a weak prime.

It is an emirp because it is prime and its reverse (199240477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 774042991 - 2⁵ = 774042959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (774042901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387021495 + 387021496.

It is an arithmetic number, because the mean of its divisors is an integer number (387021496).

Almost surely, 2^774042991 is an apocalyptic number.

774042991 is a deficient number, since it is larger than the sum of its proper divisors (1).

774042991 is an equidigital number, since it uses as much as digits as its factorization.

774042991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 774042991 is about 27821.6281155507. The cubic root of 774042991 is about 918.1670306296.

The spelling of 774042991 in words is "seven hundred seventy-four million, forty-two thousand, nine hundred ninety-one".