405030991 has 2 divisors, whose sum is σ = 405030992. Its totient is φ = 405030990.

The previous prime is 405030979. The next prime is 405031019. The reversal of 405030991 is 199030504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405030991 - 2⁷ = 405030863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405030091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202515495 + 202515496.

It is an arithmetic number, because the mean of its divisors is an integer number (202515496).

Almost surely, 2^405030991 is an apocalyptic number.

405030991 is a deficient number, since it is larger than the sum of its proper divisors (1).

405030991 is an equidigital number, since it uses as much as digits as its factorization.

405030991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 405030991 is about 20125.3817603543. The cubic root of 405030991 is about 739.8824935162.

The spelling of 405030991 in words is "four hundred five million, thirty thousand, nine hundred ninety-one".