537221731 has 2 divisors, whose sum is σ = 537221732. Its totient is φ = 537221730.

The previous prime is 537221719. The next prime is 537221753. The reversal of 537221731 is 137122735.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 537221731 - 2¹⁵ = 537188963 is a prime.

It is a super-2 number, since 2×537221731² = 577214376517272722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 537221693 and 537221702.

It is not a weakly prime, because it can be changed into another prime (537221771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268610865 + 268610866.

It is an arithmetic number, because the mean of its divisors is an integer number (268610866).

Almost surely, 2^537221731 is an apocalyptic number.

537221731 is a deficient number, since it is larger than the sum of its proper divisors (1).

537221731 is an equidigital number, since it uses as much as digits as its factorization.

537221731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 31.

The square root of 537221731 is about 23178.0441582115. The cubic root of 537221731 is about 812.9263307677.

The spelling of 537221731 in words is "five hundred thirty-seven million, two hundred twenty-one thousand, seven hundred thirty-one".