81470131 has 2 divisors, whose sum is σ = 81470132. Its totient is φ = 81470130.

The previous prime is 81470111. The next prime is 81470141. The reversal of 81470131 is 13107418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81470131 - 2⁵ = 81470099 is a prime.

It is a super-2 number, since 2×81470131² = 13274764490314322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81470096 and 81470105.

It is not a weakly prime, because it can be changed into another prime (81470111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40735065 + 40735066.

It is an arithmetic number, because the mean of its divisors is an integer number (40735066).

Almost surely, 2^81470131 is an apocalyptic number.

81470131 is a deficient number, since it is larger than the sum of its proper divisors (1).

81470131 is an equidigital number, since it uses as much as digits as its factorization.

81470131 is an evil number, because the sum of its binary digits is even.

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

The square root of 81470131 is about 9026.0806001276. The cubic root of 81470131 is about 433.5103508865.

Adding to 81470131 its reverse (13107418), we get a palindrome (94577549).

The spelling of 81470131 in words is "eighty-one million, four hundred seventy thousand, one hundred thirty-one".