81450157 has 2 divisors, whose sum is σ = 81450158. Its totient is φ = 81450156.

The previous prime is 81450151. The next prime is 81450211. The reversal of 81450157 is 75105418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56340036 + 25110121 = 7506^2 + 5011^2 .

It is a cyclic number.

It is not a de Polignac number, because 81450157 - 2¹⁵ = 81417389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81450151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40725078 + 40725079.

It is an arithmetic number, because the mean of its divisors is an integer number (40725079).

Almost surely, 2^81450157 is an apocalyptic number.

It is an amenable number.

81450157 is a deficient number, since it is larger than the sum of its proper divisors (1).

81450157 is an equidigital number, since it uses as much as digits as its factorization.

81450157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 81450157 is about 9024.9740719849. The cubic root of 81450157 is about 433.4749201367.

The spelling of 81450157 in words is "eighty-one million, four hundred fifty thousand, one hundred fifty-seven".