396221531 has 2 divisors, whose sum is σ = 396221532. Its totient is φ = 396221530.

The previous prime is 396221513. The next prime is 396221563. The reversal of 396221531 is 135122693.

Together with previous prime (396221513) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (396221563) can be obtained adding 396221531 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 396221531 - 2⁶ = 396221467 is a prime.

It is a super-2 number, since 2×396221531² = 313983003255967922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a weakly prime.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198110765 + 198110766.

It is an arithmetic number, because the mean of its divisors is an integer number (198110766).

Almost surely, 2^396221531 is an apocalyptic number.

396221531 is a deficient number, since it is larger than the sum of its proper divisors (1).

396221531 is an equidigital number, since it uses as much as digits as its factorization.

396221531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 32.

The square root of 396221531 is about 19905.3141396965. The cubic root of 396221531 is about 734.4789563075.

The spelling of 396221531 in words is "three hundred ninety-six million, two hundred twenty-one thousand, five hundred thirty-one".