8172137437 has 2 divisors, whose sum is σ = 8172137438. Its totient is φ = 8172137436.

The previous prime is 8172137411. The next prime is 8172137459. The reversal of 8172137437 is 7347312718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4128576516 + 4043560921 = 64254^2 + 63589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8172137437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8172137393 and 8172137402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8172437437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4086068718 + 4086068719.

It is an arithmetic number, because the mean of its divisors is an integer number (4086068719).

Almost surely, 2^8172137437 is an apocalyptic number.

It is an amenable number.

8172137437 is a deficient number, since it is larger than the sum of its proper divisors (1).

8172137437 is an equidigital number, since it uses as much as digits as its factorization.

8172137437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 197568, while the sum is 43.

The square root of 8172137437 is about 90399.8752045599. The cubic root of 8172137437 is about 2014.2431125025.

The spelling of 8172137437 in words is "eight billion, one hundred seventy-two million, one hundred thirty-seven thousand, four hundred thirty-seven".