2401407581 has 4 divisors (see below), whose sum is σ = 2446717212. Its totient is φ = 2356097952.

The previous prime is 2401407509. The next prime is 2401407647. The reversal of 2401407581 is 1857041042.

It is a happy number.

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 1224300100 + 1177107481 = 34990^2 + 34309^2 .

It is a cyclic number.

It is not a de Polignac number, because 2401407581 - 2¹⁸ = 2401145437 is a prime.

It is a super-2 number, since 2×2401407581² = 11533516740168543122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2401407181) 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, 22654736 + ... + 22654841.

It is an arithmetic number, because the mean of its divisors is an integer number (611679303).

Almost surely, 2^2401407581 is an apocalyptic number.

It is an amenable number.

2401407581 is a deficient number, since it is larger than the sum of its proper divisors (45309631).

2401407581 is an equidigital number, since it uses as much as digits as its factorization.

2401407581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45309630.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 2401407581 is about 49004.1588133089. The cubic root of 2401407581 is about 1339.1275937610.

The spelling of 2401407581 in words is "two billion, four hundred one million, four hundred seven thousand, five hundred eighty-one".