81725351 has 2 divisors, whose sum is σ = 81725352. Its totient is φ = 81725350.

The previous prime is 81725323. The next prime is 81725353. The reversal of 81725351 is 15352718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81725351 - 2¹⁰ = 81724327 is a prime.

Together with 81725353, 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 (81725353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40862675 + 40862676.

It is an arithmetic number, because the mean of its divisors is an integer number (40862676).

Almost surely, 2^81725351 is an apocalyptic number.

81725351 is a deficient number, since it is larger than the sum of its proper divisors (1).

81725351 is an equidigital number, since it uses as much as digits as its factorization.

81725351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 81725351 is about 9040.2074644335. The cubic root of 81725351 is about 433.9625623380.

The spelling of 81725351 in words is "eighty-one million, seven hundred twenty-five thousand, three hundred fifty-one".