645554929 has 2 divisors, whose sum is σ = 645554930. Its totient is φ = 645554928.

The previous prime is 645554909. The next prime is 645554939. The reversal of 645554929 is 929455546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549808704 + 95746225 = 23448^2 + 9785^2 .

It is a cyclic number.

It is not a de Polignac number, because 645554929 - 2⁹ = 645554417 is a prime.

It is not a weakly prime, because it can be changed into another prime (645554909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322777464 + 322777465.

It is an arithmetic number, because the mean of its divisors is an integer number (322777465).

Almost surely, 2^645554929 is an apocalyptic number.

It is an amenable number.

645554929 is a deficient number, since it is larger than the sum of its proper divisors (1).

645554929 is an equidigital number, since it uses as much as digits as its factorization.

645554929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944000, while the sum is 49.

The square root of 645554929 is about 25407.7730035515. The cubic root of 645554929 is about 864.2599745110.

The spelling of 645554929 in words is "six hundred forty-five million, five hundred fifty-four thousand, nine hundred twenty-nine".