607991 has 2 divisors, whose sum is σ = 607992. Its totient is φ = 607990.

The previous prime is 607967. The next prime is 607993. The reversal of 607991 is 199706.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 607991 - 2¹⁰ = 606967 is a prime.

Together with 607993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (607993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303995 + 303996.

It is an arithmetic number, because the mean of its divisors is an integer number (303996).

2⁶⁰⁷⁹⁹¹ is an apocalyptic number.

607991 is a deficient number, since it is larger than the sum of its proper divisors (1).

607991 is an equidigital number, since it uses as much as digits as its factorization.

607991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 607991 is about 779.7377764351. The cubic root of 607991 is about 84.7160536741.

The spelling of 607991 in words is "six hundred seven thousand, nine hundred ninety-one".