81407351 has 2 divisors, whose sum is σ = 81407352. Its totient is φ = 81407350.

The previous prime is 81407329. The next prime is 81407353. The reversal of 81407351 is 15370418.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81407351 is a prime.

Together with 81407353, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81407353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40703675 + 40703676.

It is an arithmetic number, because the mean of its divisors is an integer number (40703676).

Almost surely, 2^81407351 is an apocalyptic number.

81407351 is a deficient number, since it is larger than the sum of its proper divisors (1).

81407351 is an equidigital number, since it uses as much as digits as its factorization.

81407351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 81407351 is about 9022.6022299556. The cubic root of 81407351 is about 433.3989694792.

Adding to 81407351 its reverse (15370418), we get a palindrome (96777769).

The spelling of 81407351 in words is "eighty-one million, four hundred seven thousand, three hundred fifty-one".