1631633081 has 4 divisors (see below), whose sum is σ = 1757143332. Its totient is φ = 1506122832.

The previous prime is 1631633053. The next prime is 1631633131. The reversal of 1631633081 is 1803361361.

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 266995600 + 1364637481 = 16340^2 + 36941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1631633081 is a prime.

It is a super-2 number, since 2×1631633081² = 5324453022027105122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631633051) 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, 62755106 + ... + 62755131.

It is an arithmetic number, because the mean of its divisors is an integer number (439285833).

Almost surely, 2^1631633081 is an apocalyptic number.

It is an amenable number.

1631633081 is a deficient number, since it is larger than the sum of its proper divisors (125510251).

1631633081 is a wasteful number, since it uses less digits than its factorization.

1631633081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125510250.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1631633081 is about 40393.4781988380. The cubic root of 1631633081 is about 1177.2648228564.

The spelling of 1631633081 in words is "one billion, six hundred thirty-one million, six hundred thirty-three thousand, eighty-one".