191278481 has 4 divisors (see below), whose sum is σ = 191401200. Its totient is φ = 191155764.

The previous prime is 191278459. The next prime is 191278559. The reversal of 191278481 is 184872191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191278481 is a prime.

It is a super-2 number, since 2×191278481² = 73174914587334722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191278411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58991 + ... + 62148.

It is an arithmetic number, because the mean of its divisors is an integer number (47850300).

Almost surely, 2^191278481 is an apocalyptic number.

It is an amenable number.

191278481 is a deficient number, since it is larger than the sum of its proper divisors (122719).

191278481 is a wasteful number, since it uses less digits than its factorization.

191278481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122718.

The product of its digits is 32256, while the sum is 41.

The square root of 191278481 is about 13830.3463803334. The cubic root of 191278481 is about 576.1762748568.

The spelling of 191278481 in words is "one hundred ninety-one million, two hundred seventy-eight thousand, four hundred eighty-one".