1631875481 has 4 divisors (see below), whose sum is σ = 1671677364. Its totient is φ = 1592073600.

The previous prime is 1631875471. The next prime is 1631875537. The reversal of 1631875481 is 1845781361.

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 575040400 + 1056835081 = 23980^2 + 32509^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631875481 - 2¹⁸ = 1631613337 is a prime.

It is a super-2 number, since 2×1631875481² = 5326035170977962722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631875471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19900880 + ... + 19900961.

It is an arithmetic number, because the mean of its divisors is an integer number (417919341).

Almost surely, 2^1631875481 is an apocalyptic number.

It is an amenable number.

1631875481 is a deficient number, since it is larger than the sum of its proper divisors (39801883).

1631875481 is an equidigital number, since it uses as much as digits as its factorization.

1631875481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39801882.

The product of its digits is 161280, while the sum is 44.

The square root of 1631875481 is about 40396.4785717765. The cubic root of 1631875481 is about 1177.3231192274.

The spelling of 1631875481 in words is "one billion, six hundred thirty-one million, eight hundred seventy-five thousand, four hundred eighty-one".