420246651991 has 2 divisors, whose sum is σ = 420246651992. Its totient is φ = 420246651990.

The previous prime is 420246651901. The next prime is 420246652057. The reversal of 420246651991 is 199156642024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420246651991 - 2⁷ = 420246651863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420246651901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210123325995 + 210123325996.

It is an arithmetic number, because the mean of its divisors is an integer number (210123325996).

Almost surely, 2^420246651991 is an apocalyptic number.

420246651991 is a deficient number, since it is larger than the sum of its proper divisors (1).

420246651991 is an equidigital number, since it uses as much as digits as its factorization.

420246651991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 420246651991 in words is "four hundred twenty billion, two hundred forty-six million, six hundred fifty-one thousand, nine hundred ninety-one".