537281021 has 2 divisors, whose sum is σ = 537281022. Its totient is φ = 537281020.

The previous prime is 537280907. The next prime is 537281047. The reversal of 537281021 is 120182735.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 534765625 + 2515396 = 23125^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 537281021 - 2¹⁸ = 537018877 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (537284021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268640510 + 268640511.

It is an arithmetic number, because the mean of its divisors is an integer number (268640511).

Almost surely, 2^537281021 is an apocalyptic number.

It is an amenable number.

537281021 is a deficient number, since it is larger than the sum of its proper divisors (1).

537281021 is an equidigital number, since it uses as much as digits as its factorization.

537281021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 537281021 is about 23179.3231350702. The cubic root of 537281021 is about 812.9562356321.

The spelling of 537281021 in words is "five hundred thirty-seven million, two hundred eighty-one thousand, twenty-one".