71626381 has 2 divisors, whose sum is σ = 71626382. Its totient is φ = 71626380.

The previous prime is 71626367. The next prime is 71626453. The reversal of 71626381 is 18362617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55264356 + 16362025 = 7434^2 + 4045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71626381 is a prime.

It is a super-2 number, since 2×71626381² = 10260676910314322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71623381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35813190 + 35813191.

It is an arithmetic number, because the mean of its divisors is an integer number (35813191).

Almost surely, 2^71626381 is an apocalyptic number.

It is an amenable number.

71626381 is a deficient number, since it is larger than the sum of its proper divisors (1).

71626381 is an equidigital number, since it uses as much as digits as its factorization.

71626381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 71626381 is about 8463.2370284661. The cubic root of 71626381 is about 415.2959248030.

Adding to 71626381 its reverse (18362617), we get a palindrome (89988998).

The spelling of 71626381 in words is "seventy-one million, six hundred twenty-six thousand, three hundred eighty-one".