420515491 has 4 divisors (see below), whose sum is σ = 458744184. Its totient is φ = 382286800.

The previous prime is 420515489. The next prime is 420515497. The reversal of 420515491 is 194515024.

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

It is a cyclic number.

It is not a de Polignac number, because 420515491 - 2¹ = 420515489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420515497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19114330 + ... + 19114351.

It is an arithmetic number, because the mean of its divisors is an integer number (114686046).

Almost surely, 2^420515491 is an apocalyptic number.

420515491 is a deficient number, since it is larger than the sum of its proper divisors (38228693).

420515491 is a wasteful number, since it uses less digits than its factorization.

420515491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38228692.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 420515491 is about 20506.4743678673. The cubic root of 420515491 is about 749.1934980875.

The spelling of 420515491 in words is "four hundred twenty million, five hundred fifteen thousand, four hundred ninety-one".