191863481 has 2 divisors, whose sum is σ = 191863482. Its totient is φ = 191863480.

The previous prime is 191863471. The next prime is 191863487. The reversal of 191863481 is 184368191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135373225 + 56490256 = 11635^2 + 7516^2 .

It is a cyclic number.

It is not a de Polignac number, because 191863481 - 2⁶ = 191863417 is a prime.

It is a super-2 number, since 2×191863481² = 73623190682874722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (191863487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95931740 + 95931741.

It is an arithmetic number, because the mean of its divisors is an integer number (95931741).

Almost surely, 2^191863481 is an apocalyptic number.

It is an amenable number.

191863481 is a deficient number, since it is larger than the sum of its proper divisors (1).

191863481 is an equidigital number, since it uses as much as digits as its factorization.

191863481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 191863481 is about 13851.4793794742. The cubic root of 191863481 is about 576.7630634327.

The spelling of 191863481 in words is "one hundred ninety-one million, eight hundred sixty-three thousand, four hundred eighty-one".