81470031 has 8 divisors (see below), whose sum is σ = 108842160. Its totient is φ = 54205632.

The previous prime is 81470017. The next prime is 81470047. The reversal of 81470031 is 13007418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81470031 - 2¹³ = 81461839 is a prime.

It is a super-2 number, since 2×81470031² = 13274731902281922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81469983 and 81470010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81470131) 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, 25150 + ... + 28203.

It is an arithmetic number, because the mean of its divisors is an integer number (13605270).

Almost surely, 2^81470031 is an apocalyptic number.

81470031 is a deficient number, since it is larger than the sum of its proper divisors (27372129).

81470031 is a wasteful number, since it uses less digits than its factorization.

81470031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53865.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 81470031 is about 9026.0750606230. The cubic root of 81470031 is about 433.5101735166.

Adding to 81470031 its reverse (13007418), we get a palindrome (94477449).

The spelling of 81470031 in words is "eighty-one million, four hundred seventy thousand, thirty-one".