421445545 has 8 divisors (see below), whose sum is σ = 523173960. Its totient is φ = 325530240.

The previous prime is 421445513. The next prime is 421445573. The reversal of 421445545 is 545544124.

It can be written as a sum of positive squares in 4 ways, for example, as 1236544 + 420209001 = 1112^2 + 20499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421445545 - 2⁵ = 421445513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421445545.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1453116 + ... + 1453405.

It is an arithmetic number, because the mean of its divisors is an integer number (65396745).

Almost surely, 2^421445545 is an apocalyptic number.

It is an amenable number.

421445545 is a deficient number, since it is larger than the sum of its proper divisors (101728415).

421445545 is a wasteful number, since it uses less digits than its factorization.

421445545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906555.

The product of its digits is 64000, while the sum is 34.

The square root of 421445545 is about 20529.1389249525. The cubic root of 421445545 is about 749.7454217445.

Adding to 421445545 its reverse (545544124), we get a palindrome (966989669).

The spelling of 421445545 in words is "four hundred twenty-one million, four hundred forty-five thousand, five hundred forty-five".