581361021 has 12 divisors (see below), whose sum is σ = 840565440. Its totient is φ = 387194760.

The previous prime is 581361013. The next prime is 581361029. The reversal of 581361021 is 120163185.

581361021 is a `hidden beast` number, since 581 + 3 + 61 + 0 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (581361013) and next prime (581361029).

It is not a de Polignac number, because 581361021 - 2³ = 581361013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581361029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21735 + ... + 40436.

It is an arithmetic number, because the mean of its divisors is an integer number (70047120).

Almost surely, 2^581361021 is an apocalyptic number.

It is an amenable number.

581361021 is a deficient number, since it is larger than the sum of its proper divisors (259204419).

581361021 is a wasteful number, since it uses less digits than its factorization.

581361021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63216 (or 63213 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 581361021 is about 24111.4292608298. The cubic root of 581361021 is about 834.6068982828.

The spelling of 581361021 in words is "five hundred eighty-one million, three hundred sixty-one thousand, twenty-one".