81241337 has 2 divisors, whose sum is σ = 81241338. Its totient is φ = 81241336.

The previous prime is 81241331. The next prime is 81241343. The reversal of 81241337 is 73314218.

It is a balanced prime because it is at equal distance from previous prime (81241331) and next prime (81241343).

It can be written as a sum of positive squares in only one way, i.e., 69572281 + 11669056 = 8341^2 + 3416^2 .

It is a cyclic number.

It is not a de Polignac number, because 81241337 - 2⁶ = 81241273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81241331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40620668 + 40620669.

It is an arithmetic number, because the mean of its divisors is an integer number (40620669).

Almost surely, 2^81241337 is an apocalyptic number.

It is an amenable number.

81241337 is a deficient number, since it is larger than the sum of its proper divisors (1).

81241337 is an equidigital number, since it uses as much as digits as its factorization.

81241337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 81241337 is about 9013.3976390704. The cubic root of 81241337 is about 433.1041588323.

The spelling of 81241337 in words is "eighty-one million, two hundred forty-one thousand, three hundred thirty-seven".