537137981 has 2 divisors, whose sum is σ = 537137982. Its totient is φ = 537137980.

The previous prime is 537137969. The next prime is 537138047. The reversal of 537137981 is 189731735.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 451945081 + 85192900 = 21259^2 + 9230^2 .

It is a cyclic number.

It is not a de Polignac number, because 537137981 - 2¹⁴ = 537121597 is a prime.

It is a super-2 number, since 2×537137981² = 577034421265512722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (537137941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268568990 + 268568991.

It is an arithmetic number, because the mean of its divisors is an integer number (268568991).

Almost surely, 2^537137981 is an apocalyptic number.

It is an amenable number.

537137981 is a deficient number, since it is larger than the sum of its proper divisors (1).

537137981 is an equidigital number, since it uses as much as digits as its factorization.

537137981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 44.

The square root of 537137981 is about 23176.2374211173. The cubic root of 537137981 is about 812.8840849472.

The spelling of 537137981 in words is "five hundred thirty-seven million, one hundred thirty-seven thousand, nine hundred eighty-one".