191421463 has 2 divisors, whose sum is σ = 191421464. Its totient is φ = 191421462.

The previous prime is 191421457. The next prime is 191421493. The reversal of 191421463 is 364124191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191421463 - 2¹⁷ = 191290391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191421493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95710731 + 95710732.

It is an arithmetic number, because the mean of its divisors is an integer number (95710732).

Almost surely, 2^191421463 is an apocalyptic number.

191421463 is a deficient number, since it is larger than the sum of its proper divisors (1).

191421463 is an equidigital number, since it uses as much as digits as its factorization.

191421463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 191421463 is about 13835.5145549416. The cubic root of 191421463 is about 576.3198043624.

The spelling of 191421463 in words is "one hundred ninety-one million, four hundred twenty-one thousand, four hundred sixty-three".