7312172537 has 2 divisors, whose sum is σ = 7312172538. Its totient is φ = 7312172536.

The previous prime is 7312172473. The next prime is 7312172551. The reversal of 7312172537 is 7352712137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6536884201 + 775288336 = 80851^2 + 27844^2 .

It is a cyclic number.

It is not a de Polignac number, because 7312172537 - 2⁶ = 7312172473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7312172537.

It is not a weakly prime, because it can be changed into another prime (7312172557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3656086268 + 3656086269.

It is an arithmetic number, because the mean of its divisors is an integer number (3656086269).

Almost surely, 2^7312172537 is an apocalyptic number.

It is an amenable number.

7312172537 is a deficient number, since it is larger than the sum of its proper divisors (1).

7312172537 is an equidigital number, since it uses as much as digits as its factorization.

7312172537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61740, while the sum is 38.

The square root of 7312172537 is about 85511.2421673314. The cubic root of 7312172537 is about 1940.9550454917.

The spelling of 7312172537 in words is "seven billion, three hundred twelve million, one hundred seventy-two thousand, five hundred thirty-seven".