71238631 has 4 divisors (see below), whose sum is σ = 72242064. Its totient is φ = 70235200.

The previous prime is 71238571. The next prime is 71238637. The reversal of 71238631 is 13683217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13683217 = 41 ⋅333737.

It is a cyclic number.

It is not a de Polignac number, because 71238631 - 2²³ = 62850023 is a prime.

It is a super-2 number, since 2×71238631² = 10149885093508322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71238593 and 71238602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71238637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501610 + ... + 501751.

It is an arithmetic number, because the mean of its divisors is an integer number (18060516).

Almost surely, 2^71238631 is an apocalyptic number.

71238631 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

71238631 is a deficient number, since it is larger than the sum of its proper divisors (1003433).

71238631 is a wasteful number, since it uses less digits than its factorization.

71238631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003432.

The product of its digits is 6048, while the sum is 31.

The square root of 71238631 is about 8440.2980397614. The cubic root of 71238631 is about 414.5451657924.

The spelling of 71238631 in words is "seventy-one million, two hundred thirty-eight thousand, six hundred thirty-one".