431061557 has 2 divisors, whose sum is σ = 431061558. Its totient is φ = 431061556.

The previous prime is 431061529. The next prime is 431061613. The reversal of 431061557 is 755160134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 431019121 + 42436 = 20761^2 + 206^2 .

It is a cyclic number.

It is not a de Polignac number, because 431061557 - 2¹⁰ = 431060533 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 (431063557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215530778 + 215530779.

It is an arithmetic number, because the mean of its divisors is an integer number (215530779).

Almost surely, 2^431061557 is an apocalyptic number.

It is an amenable number.

431061557 is a deficient number, since it is larger than the sum of its proper divisors (1).

431061557 is an equidigital number, since it uses as much as digits as its factorization.

431061557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 431061557 is about 20762.0219872728. The cubic root of 431061557 is about 755.4048423059.

The spelling of 431061557 in words is "four hundred thirty-one million, sixty-one thousand, five hundred fifty-seven".