2189631761 has 2 divisors, whose sum is σ = 2189631762. Its totient is φ = 2189631760.

The previous prime is 2189631751. The next prime is 2189631779. The reversal of 2189631761 is 1671369812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1997643025 + 191988736 = 44695^2 + 13856^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189631761 - 2¹⁴ = 2189615377 is a prime.

It is a super-2 number, since 2×2189631761² = 9588974497559922242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2189631751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094815880 + 1094815881.

It is an arithmetic number, because the mean of its divisors is an integer number (1094815881).

Almost surely, 2^2189631761 is an apocalyptic number.

It is an amenable number.

2189631761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189631761 is an equidigital number, since it uses as much as digits as its factorization.

2189631761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 2189631761 is about 46793.5012688728. The cubic root of 2189631761 is about 1298.5450707071.

The spelling of 2189631761 in words is "two billion, one hundred eighty-nine million, six hundred thirty-one thousand, seven hundred sixty-one".