1631261089 has 4 divisors (see below), whose sum is σ = 1642209300. Its totient is φ = 1620312880.

The previous prime is 1631261081. The next prime is 1631261111. The reversal of 1631261089 is 9801621361.

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 567392400 + 1063868689 = 23820^2 + 32617^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631261089 - 2³ = 1631261081 is a prime.

It is a super-2 number, since 2×1631261089² = 5322025480970931842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631261081) 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, 5473882 + ... + 5474179.

It is an arithmetic number, because the mean of its divisors is an integer number (410552325).

Almost surely, 2^1631261089 is an apocalyptic number.

It is an amenable number.

1631261089 is a deficient number, since it is larger than the sum of its proper divisors (10948211).

1631261089 is a wasteful number, since it uses less digits than its factorization.

1631261089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10948210.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1631261089 is about 40388.8733316492. The cubic root of 1631261089 is about 1177.1753488224.

The spelling of 1631261089 in words is "one billion, six hundred thirty-one million, two hundred sixty-one thousand, eighty-nine".