531621749 has 2 divisors, whose sum is σ = 531621750. Its totient is φ = 531621748.

The previous prime is 531621743. The next prime is 531621799. The reversal of 531621749 is 947126135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296459524 + 235162225 = 17218^2 + 15335^2 .

It is a cyclic number.

It is not a de Polignac number, because 531621749 - 2¹⁶ = 531556213 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 (531621743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265810874 + 265810875.

It is an arithmetic number, because the mean of its divisors is an integer number (265810875).

Almost surely, 2^531621749 is an apocalyptic number.

It is an amenable number.

531621749 is a deficient number, since it is larger than the sum of its proper divisors (1).

531621749 is an equidigital number, since it uses as much as digits as its factorization.

531621749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 531621749 is about 23056.9241010157. The cubic root of 531621749 is about 810.0918195968.

The spelling of 531621749 in words is "five hundred thirty-one million, six hundred twenty-one thousand, seven hundred forty-nine".