81411037 has 2 divisors, whose sum is σ = 81411038. Its totient is φ = 81411036.

The previous prime is 81411023. The next prime is 81411047. The reversal of 81411037 is 73011418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57927321 + 23483716 = 7611^2 + 4846^2 .

It is a cyclic number.

It is not a de Polignac number, because 81411037 - 2¹¹ = 81408989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81411047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40705518 + 40705519.

It is an arithmetic number, because the mean of its divisors is an integer number (40705519).

Almost surely, 2^81411037 is an apocalyptic number.

It is an amenable number.

81411037 is a deficient number, since it is larger than the sum of its proper divisors (1).

81411037 is an equidigital number, since it uses as much as digits as its factorization.

81411037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 81411037 is about 9022.8064924390. The cubic root of 81411037 is about 433.4055105940.

The spelling of 81411037 in words is "eighty-one million, four hundred eleven thousand, thirty-seven".