420100387491 has 4 divisors (see below), whose sum is σ = 560133849992. Its totient is φ = 280066924992.

The previous prime is 420100387429. The next prime is 420100387501. The reversal of 420100387491 is 194783001024.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 420100387491 - 2¹⁷ = 420100256419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420100317491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70016731246 + ... + 70016731251.

It is an arithmetic number, because the mean of its divisors is an integer number (140033462498).

Almost surely, 2^420100387491 is an apocalyptic number.

420100387491 is a deficient number, since it is larger than the sum of its proper divisors (140033462501).

420100387491 is a wasteful number, since it uses less digits than its factorization.

420100387491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140033462500.

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 420100387491 in words is "four hundred twenty billion, one hundred million, three hundred eighty-seven thousand, four hundred ninety-one".