81351451 has 2 divisors, whose sum is σ = 81351452. Its totient is φ = 81351450.

The previous prime is 81351379. The next prime is 81351461. The reversal of 81351451 is 15415318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81351451 - 2⁷ = 81351323 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81351461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40675725 + 40675726.

It is an arithmetic number, because the mean of its divisors is an integer number (40675726).

Almost surely, 2^81351451 is an apocalyptic number.

81351451 is a deficient number, since it is larger than the sum of its proper divisors (1).

81351451 is an equidigital number, since it uses as much as digits as its factorization.

81351451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 28.

The square root of 81351451 is about 9019.5039220569. The cubic root of 81351451 is about 433.2997460489.

Adding to 81351451 its reverse (15415318), we get a palindrome (96766769).

The spelling of 81351451 in words is "eighty-one million, three hundred fifty-one thousand, four hundred fifty-one".