81301070 has 16 divisors (see below), whose sum is σ = 149456448. Its totient is φ = 31828320.

The previous prime is 81301069. The next prime is 81301091. The reversal of 81301070 is 7010318.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86021 + ... + 86960.

It is an arithmetic number, because the mean of its divisors is an integer number (9341028).

Almost surely, 2^81301070 is an apocalyptic number.

81301070 is a deficient number, since it is larger than the sum of its proper divisors (68155378).

81301070 is a wasteful number, since it uses less digits than its factorization.

81301070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173035.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 81301070 is about 9016.7105975516. The cubic root of 81301070 is about 433.2102799843.

Adding to 81301070 its reverse (7010318), we get a palindrome (88311388).

The spelling of 81301070 in words is "eighty-one million, three hundred one thousand, seventy".