81062513 has 6 divisors (see below), whose sum is σ = 94297266. Its totient is φ = 69482112.

The previous prime is 81062497. The next prime is 81062539. The reversal of 81062513 is 31526018.

It can be written as a sum of positive squares in only one way, i.e., 80156209 + 906304 = 8953^2 + 952^2 .

It is not a de Polignac number, because 81062513 - 2⁴ = 81062497 is a prime.

It is a super-2 number, since 2×81062513² = 13142262027750338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81062213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 827120 + ... + 827217.

It is an arithmetic number, because the mean of its divisors is an integer number (15716211).

Almost surely, 2^81062513 is an apocalyptic number.

It is an amenable number.

81062513 is a deficient number, since it is larger than the sum of its proper divisors (13234753).

81062513 is a wasteful number, since it uses less digits than its factorization.

81062513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654351 (or 1654344 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 81062513 is about 9003.4722746283. The cubic root of 81062513 is about 432.7861503063.

The spelling of 81062513 in words is "eighty-one million, sixty-two thousand, five hundred thirteen".