72012631 has 2 divisors, whose sum is σ = 72012632. Its totient is φ = 72012630.

The previous prime is 72012623. The next prime is 72012643. The reversal of 72012631 is 13621027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72012631 - 2³ = 72012623 is a prime.

It is a super-3 number, since 3×72012631³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72012331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36006315 + 36006316.

It is an arithmetic number, because the mean of its divisors is an integer number (36006316).

Almost surely, 2^72012631 is an apocalyptic number.

72012631 is a deficient number, since it is larger than the sum of its proper divisors (1).

72012631 is an equidigital number, since it uses as much as digits as its factorization.

72012631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 72012631 is about 8486.0256304114. The cubic root of 72012631 is about 416.0410905386.

Adding to 72012631 its reverse (13621027), we get a palindrome (85633658).

The spelling of 72012631 in words is "seventy-two million, twelve thousand, six hundred thirty-one".