190661641 has 2 divisors, whose sum is σ = 190661642. Its totient is φ = 190661640.

The previous prime is 190661633. The next prime is 190661659. The reversal of 190661641 is 146166091.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150921225 + 39740416 = 12285^2 + 6304^2 .

It is an emirp because it is prime and its reverse (146166091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190661641 - 2³ = 190661633 is a prime.

It is a super-2 number, since 2×190661641² = 72703722697625762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 190661597 and 190661606.

It is not a weakly prime, because it can be changed into another prime (190668641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95330820 + 95330821.

It is an arithmetic number, because the mean of its divisors is an integer number (95330821).

Almost surely, 2^190661641 is an apocalyptic number.

It is an amenable number.

190661641 is a deficient number, since it is larger than the sum of its proper divisors (1).

190661641 is an equidigital number, since it uses as much as digits as its factorization.

190661641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 190661641 is about 13808.0281358346. The cubic root of 190661641 is about 575.5562516300.

The spelling of 190661641 in words is "one hundred ninety million, six hundred sixty-one thousand, six hundred forty-one".