42310991 has 2 divisors, whose sum is σ = 42310992. Its totient is φ = 42310990.

The previous prime is 42310987. The next prime is 42310999. The reversal of 42310991 is 19901324.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42310991 - 2² = 42310987 is a prime.

It is equal to p_2565452 and since 42310991 and 2565452 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 (42310999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21155495 + 21155496.

It is an arithmetic number, because the mean of its divisors is an integer number (21155496).

Almost surely, 2^42310991 is an apocalyptic number.

42310991 is a deficient number, since it is larger than the sum of its proper divisors (1).

42310991 is an equidigital number, since it uses as much as digits as its factorization.

42310991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 42310991 is about 6504.6899234322. The cubic root of 42310991 is about 348.4585024146.

The spelling of 42310991 in words is "forty-two million, three hundred ten thousand, nine hundred ninety-one".