2188490761 has 2 divisors, whose sum is σ = 2188490762. Its totient is φ = 2188490760.

The previous prime is 2188490677. The next prime is 2188490803. The reversal of 2188490761 is 1670948812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1267004025 + 921486736 = 35595^2 + 30356^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188490761 - 2¹¹ = 2188488713 is a prime.

It is not a weakly prime, because it can be changed into another prime (2188490561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094245380 + 1094245381.

It is an arithmetic number, because the mean of its divisors is an integer number (1094245381).

Almost surely, 2^2188490761 is an apocalyptic number.

It is an amenable number.

2188490761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188490761 is an equidigital number, since it uses as much as digits as its factorization.

2188490761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 2188490761 is about 46781.3078162635. The cubic root of 2188490761 is about 1298.3194776213.

The spelling of 2188490761 in words is "two billion, one hundred eighty-eight million, four hundred ninety thousand, seven hundred sixty-one".