9891451 has 2 divisors, whose sum is σ = 9891452. Its totient is φ = 9891450.

The previous prime is 9891439. The next prime is 9891461. The reversal of 9891451 is 1541989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9891451 - 2¹⁵ = 9858683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9891451.

It is not a weakly prime, because it can be changed into another prime (9891461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4945725 + 4945726.

It is an arithmetic number, because the mean of its divisors is an integer number (4945726).

Almost surely, 2^9891451 is an apocalyptic number.

9891451 is a deficient number, since it is larger than the sum of its proper divisors (1).

9891451 is an equidigital number, since it uses as much as digits as its factorization.

9891451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 37.

The square root of 9891451 is about 3145.0677258209. The cubic root of 9891451 is about 214.6610921592.

The spelling of 9891451 in words is "nine million, eight hundred ninety-one thousand, four hundred fifty-one".