81051770 has 16 divisors (see below), whose sum is σ = 152236800. Its totient is φ = 31011024.

The previous prime is 81051743. The next prime is 81051791. The reversal of 81051770 is 7715018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175970 + ... + 176429.

It is an arithmetic number, because the mean of its divisors is an integer number (9514800).

Almost surely, 2^81051770 is an apocalyptic number.

81051770 is a deficient number, since it is larger than the sum of its proper divisors (71185030).

81051770 is a wasteful number, since it uses less digits than its factorization.

81051770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352429.

The product of its (nonzero) digits is 1960, while the sum is 29.

The square root of 81051770 is about 9002.8756517015. The cubic root of 81051770 is about 432.7670307945.

Adding to 81051770 its reverse (7715018), we get a palindrome (88766788).

The spelling of 81051770 in words is "eighty-one million, fifty-one thousand, seven hundred seventy".