1461620581 has 16 divisors (see below), whose sum is σ = 1591206400. Its totient is φ = 1337472000.

The previous prime is 1461620551. The next prime is 1461620597. The reversal of 1461620581 is 1850261641.

It is a cyclic number.

It is not a de Polignac number, because 1461620581 - 2⁵ = 1461620549 is a prime.

It is a super-2 number, since 2×1461620581² = 4272669445605555122, 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 (1461620551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351925 + ... + 356053.

It is an arithmetic number, because the mean of its divisors is an integer number (99450400).

Almost surely, 2^1461620581 is an apocalyptic number.

It is an amenable number.

1461620581 is a deficient number, since it is larger than the sum of its proper divisors (129585819).

1461620581 is a wasteful number, since it uses less digits than its factorization.

1461620581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1461620581 is about 38231.1467392753. The cubic root of 1461620581 is about 1134.8667793725.

The spelling of 1461620581 in words is "one billion, four hundred sixty-one million, six hundred twenty thousand, five hundred eighty-one".