81214131 has 8 divisors (see below), whose sum is σ = 109810944. Its totient is φ = 53380040.

The previous prime is 81214103. The next prime is 81214139. The reversal of 81214131 is 13141218.

It is a happy number.

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 81214131 - 2⁵ = 81214099 is a prime.

It is a super-2 number, since 2×81214131² = 13191470148170322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81214098 and 81214107.

It is not an unprimeable number, because it can be changed into a prime (81214139) 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, 190431 + ... + 190856.

It is an arithmetic number, because the mean of its divisors is an integer number (13726368).

Almost surely, 2^81214131 is an apocalyptic number.

81214131 is a deficient number, since it is larger than the sum of its proper divisors (28596813).

81214131 is a wasteful number, since it uses less digits than its factorization.

81214131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381361.

The product of its digits is 192, while the sum is 21.

The square root of 81214131 is about 9011.8883148872. Note that the first 3 decimals coincide. The cubic root of 81214131 is about 433.0558076369.

Adding to 81214131 its reverse (13141218), we get a palindrome (94355349).

The spelling of 81214131 in words is "eighty-one million, two hundred fourteen thousand, one hundred thirty-one".