657531481 has 2 divisors, whose sum is σ = 657531482. Its totient is φ = 657531480.

The previous prime is 657531467. The next prime is 657531527. The reversal of 657531481 is 184135756.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 655616025 + 1915456 = 25605^2 + 1384^2 .

It is a cyclic number.

It is not a de Polignac number, because 657531481 - 2⁵ = 657531449 is a prime.

It is a super-2 number, since 2×657531481² = 864695297012106722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (657531401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328765740 + 328765741.

It is an arithmetic number, because the mean of its divisors is an integer number (328765741).

Almost surely, 2^657531481 is an apocalyptic number.

It is an amenable number.

657531481 is a deficient number, since it is larger than the sum of its proper divisors (1).

657531481 is an equidigital number, since it uses as much as digits as its factorization.

657531481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 40.

The square root of 657531481 is about 25642.3766644202. The cubic root of 657531481 is about 869.5719394164.

The spelling of 657531481 in words is "six hundred fifty-seven million, five hundred thirty-one thousand, four hundred eighty-one".