1020190581 has 12 divisors (see below), whose sum is σ = 1474499052. Its totient is φ = 679716096.

The previous prime is 1020190573. The next prime is 1020190607. The reversal of 1020190581 is 1850910201.

It can be written as a sum of positive squares in 2 ways, for example, as 654080625 + 366109956 = 25575^2 + 19134^2 .

It is not a de Polignac number, because 1020190581 - 2³ = 1020190573 is a prime.

It is a super-2 number, since 2×1020190581² = 2081577643122235122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020190511) 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, 18126 + ... + 48671.

It is an arithmetic number, because the mean of its divisors is an integer number (122874921).

Almost surely, 2^1020190581 is an apocalyptic number.

It is an amenable number.

1020190581 is a deficient number, since it is larger than the sum of its proper divisors (454308471).

1020190581 is a wasteful number, since it uses less digits than its factorization.

1020190581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68500 (or 68497 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 1020190581 is about 31940.4223672762. The cubic root of 1020190581 is about 1006.6853994998.

The spelling of 1020190581 in words is "one billion, twenty million, one hundred ninety thousand, five hundred eighty-one".