81050357 has 2 divisors, whose sum is σ = 81050358. Its totient is φ = 81050356.

The previous prime is 81050323. The next prime is 81050377. The reversal of 81050357 is 75305018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73942801 + 7107556 = 8599^2 + 2666^2 .

It is a cyclic number.

It is not a de Polignac number, because 81050357 - 2¹² = 81046261 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81050377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40525178 + 40525179.

It is an arithmetic number, because the mean of its divisors is an integer number (40525179).

Almost surely, 2^81050357 is an apocalyptic number.

It is an amenable number.

81050357 is a deficient number, since it is larger than the sum of its proper divisors (1).

81050357 is an equidigital number, since it uses as much as digits as its factorization.

81050357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 81050357 is about 9002.7971764336. The cubic root of 81050357 is about 432.7645159270.

The spelling of 81050357 in words is "eighty-one million, fifty thousand, three hundred fifty-seven".