531413921 has 2 divisors, whose sum is σ = 531413922. Its totient is φ = 531413920.

The previous prime is 531413903. The next prime is 531413923. The reversal of 531413921 is 129314135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 523906321 + 7507600 = 22889^2 + 2740^2 .

It is a cyclic number.

It is not a de Polignac number, because 531413921 - 2²² = 527219617 is a prime.

Together with 531413923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (531413923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265706960 + 265706961.

It is an arithmetic number, because the mean of its divisors is an integer number (265706961).

Almost surely, 2^531413921 is an apocalyptic number.

It is an amenable number.

531413921 is a deficient number, since it is larger than the sum of its proper divisors (1).

531413921 is an equidigital number, since it uses as much as digits as its factorization.

531413921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 531413921 is about 23052.4168147290. The cubic root of 531413921 is about 809.9862422090.

The spelling of 531413921 in words is "five hundred thirty-one million, four hundred thirteen thousand, nine hundred twenty-one".