420172511 has 4 divisors (see below), whose sum is σ = 458370024. Its totient is φ = 381975000.

The previous prime is 420172427. The next prime is 420172513. The reversal of 420172511 is 115271024.

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

It is not a de Polignac number, because 420172511 - 2¹⁰ = 420171487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420172513) 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, 19098740 + ... + 19098761.

It is an arithmetic number, because the mean of its divisors is an integer number (114592506).

Almost surely, 2^420172511 is an apocalyptic number.

420172511 is a deficient number, since it is larger than the sum of its proper divisors (38197513).

420172511 is a wasteful number, since it uses less digits than its factorization.

420172511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38197512.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 420172511 is about 20498.1099372601. The cubic root of 420172511 is about 748.9897574539.

The spelling of 420172511 in words is "four hundred twenty million, one hundred seventy-two thousand, five hundred eleven".