421557089 has 4 divisors (see below), whose sum is σ = 424242324. Its totient is φ = 418871856.

The previous prime is 421557077. The next prime is 421557107. The reversal of 421557089 is 980755124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 164275489 + 257281600 = 12817^2 + 16040^2 .

It is a cyclic number.

It is not a de Polignac number, because 421557089 - 2⁸ = 421556833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421557029) 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, 1342382 + ... + 1342695.

It is an arithmetic number, because the mean of its divisors is an integer number (106060581).

Almost surely, 2^421557089 is an apocalyptic number.

It is an amenable number.

421557089 is a deficient number, since it is larger than the sum of its proper divisors (2685235).

421557089 is a wasteful number, since it uses less digits than its factorization.

421557089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685234.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 421557089 is about 20531.8554690023. The cubic root of 421557089 is about 749.8115609546.

The spelling of 421557089 in words is "four hundred twenty-one million, five hundred fifty-seven thousand, eighty-nine".