81007351 has 2 divisors, whose sum is σ = 81007352. Its totient is φ = 81007350.

The previous prime is 81007321. The next prime is 81007361. The reversal of 81007351 is 15370018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81007351 - 2⁹ = 81006839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81007321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40503675 + 40503676.

It is an arithmetic number, because the mean of its divisors is an integer number (40503676).

Almost surely, 2^81007351 is an apocalyptic number.

81007351 is a deficient number, since it is larger than the sum of its proper divisors (1).

81007351 is an equidigital number, since it uses as much as digits as its factorization.

81007351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 81007351 is about 9000.4083796237. The cubic root of 81007351 is about 432.6879595563.

Adding to 81007351 its reverse (15370018), we get a palindrome (96377369).

It can be divided in two parts, 8100 and 7351, that added together give a palindrome (15451).

The spelling of 81007351 in words is "eighty-one million, seven thousand, three hundred fifty-one".