81348482137 has 8 divisors (see below), whose sum is σ = 88806141704. Its totient is φ = 74062263168.

The previous prime is 81348482101. The next prime is 81348482141. The reversal of 81348482137 is 73128484318.

It can be written as a sum of positive squares in 4 ways, for example, as 16415759376 + 64932722761 = 128124^2 + 254819^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81348482137 - 2¹⁹ = 81347957849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81348482177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42859158 + ... + 42861055.

It is an arithmetic number, because the mean of its divisors is an integer number (11100767713).

Almost surely, 2^81348482137 is an apocalyptic number.

It is an amenable number.

81348482137 is a deficient number, since it is larger than the sum of its proper divisors (7457659567).

81348482137 is a wasteful number, since it uses less digits than its factorization.

81348482137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85720299.

The product of its digits is 1032192, while the sum is 49.

The spelling of 81348482137 in words is "eighty-one billion, three hundred forty-eight million, four hundred eighty-two thousand, one hundred thirty-seven".