191441881 has 2 divisors, whose sum is σ = 191441882. Its totient is φ = 191441880.

The previous prime is 191441869. The next prime is 191441909. The reversal of 191441881 is 188144191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131905225 + 59536656 = 11485^2 + 7716^2 .

It is a cyclic number.

It is not a de Polignac number, because 191441881 - 2¹³ = 191433689 is a prime.

It is a super-2 number, since 2×191441881² = 73299987601636322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191441881.

It is not a weakly prime, because it can be changed into another prime (191441821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95720940 + 95720941.

It is an arithmetic number, because the mean of its divisors is an integer number (95720941).

Almost surely, 2^191441881 is an apocalyptic number.

It is an amenable number.

191441881 is a deficient number, since it is larger than the sum of its proper divisors (1).

191441881 is an equidigital number, since it uses as much as digits as its factorization.

191441881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 37.

The square root of 191441881 is about 13836.2524189175. The cubic root of 191441881 is about 576.3402947142.

It can be divided in two parts, 19144 and 1881, that added together give a square (21025 = 145²).

The spelling of 191441881 in words is "one hundred ninety-one million, four hundred forty-one thousand, eight hundred eighty-one".