2190546881 has 2 divisors, whose sum is σ = 2190546882. Its totient is φ = 2190546880.

The previous prime is 2190546863. The next prime is 2190546913. The reversal of 2190546881 is 1886450912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2053539856 + 137007025 = 45316^2 + 11705^2 .

It is a cyclic number.

It is not a de Polignac number, because 2190546881 - 2¹⁰ = 2190545857 is a prime.

It is a super-2 number, since 2×2190546881² = 9596991275717656322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2190546851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095273440 + 1095273441.

It is an arithmetic number, because the mean of its divisors is an integer number (1095273441).

Almost surely, 2^2190546881 is an apocalyptic number.

It is an amenable number.

2190546881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2190546881 is an equidigital number, since it uses as much as digits as its factorization.

2190546881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 2190546881 is about 46803.2785283253. The cubic root of 2190546881 is about 1298.7259472480.

It can be divided in two parts, 21905 and 46881, that added together give a palindrome (68786).

The spelling of 2190546881 in words is "two billion, one hundred ninety million, five hundred forty-six thousand, eight hundred eighty-one".