531421369 has 2 divisors, whose sum is σ = 531421370. Its totient is φ = 531421368.

The previous prime is 531421357. The next prime is 531421381. The reversal of 531421369 is 963124135.

It is a balanced prime because it is at equal distance from previous prime (531421357) and next prime (531421381).

It can be written as a sum of positive squares in only one way, i.e., 476112400 + 55308969 = 21820^2 + 7437^2 .

It is a cyclic number.

It is not a de Polignac number, because 531421369 - 2⁵ = 531421337 is a prime.

It is a super-2 number, since 2×531421369² = 564817342859668322, which contains 22 as substring.

It is equal to p_27921355 and since 531421369 and 27921355 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (531421169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265710684 + 265710685.

It is an arithmetic number, because the mean of its divisors is an integer number (265710685).

Almost surely, 2^531421369 is an apocalyptic number.

It is an amenable number.

531421369 is a deficient number, since it is larger than the sum of its proper divisors (1).

531421369 is an equidigital number, since it uses as much as digits as its factorization.

531421369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 531421369 is about 23052.5783590470. The cubic root of 531421369 is about 809.9900262959.

Adding to 531421369 its product of digits (19440), we get a square (531440809 = 23053²).

The spelling of 531421369 in words is "five hundred thirty-one million, four hundred twenty-one thousand, three hundred sixty-nine".