787422991 has 2 divisors, whose sum is σ = 787422992. Its totient is φ = 787422990.

The previous prime is 787422973. The next prime is 787422997. The reversal of 787422991 is 199224787.

It is a strong prime.

It is an emirp because it is prime and its reverse (199224787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 787422991 - 2⁵ = 787422959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (787422997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393711495 + 393711496.

It is an arithmetic number, because the mean of its divisors is an integer number (393711496).

Almost surely, 2^787422991 is an apocalyptic number.

787422991 is a deficient number, since it is larger than the sum of its proper divisors (1).

787422991 is an equidigital number, since it uses as much as digits as its factorization.

787422991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The square root of 787422991 is about 28061.0582658602. The cubic root of 787422991 is about 923.4272728547.

The spelling of 787422991 in words is "seven hundred eighty-seven million, four hundred twenty-two thousand, nine hundred ninety-one".