1890900461 has 2 divisors, whose sum is σ = 1890900462. Its totient is φ = 1890900460.

The previous prime is 1890900437. The next prime is 1890900481. The reversal of 1890900461 is 1640090981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1504974436 + 385926025 = 38794^2 + 19645^2 .

It is an emirp because it is prime and its reverse (1640090981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1890900461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1890900421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945450230 + 945450231.

It is an arithmetic number, because the mean of its divisors is an integer number (945450231).

Almost surely, 2^1890900461 is an apocalyptic number.

It is an amenable number.

1890900461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890900461 is an equidigital number, since it uses as much as digits as its factorization.

1890900461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1890900461 is about 43484.4852907333. The cubic root of 1890900461 is about 1236.5819109733.

The spelling of 1890900461 in words is "one billion, eight hundred ninety million, nine hundred thousand, four hundred sixty-one".