648969129 has 12 divisors (see below), whose sum is σ = 937628016. Its totient is φ = 432540792.

The previous prime is 648969109. The next prime is 648969131. The reversal of 648969129 is 921969846.

It is not a de Polignac number, because 648969129 - 2¹³ = 648960937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (648969109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53574 + ... + 64560.

It is an arithmetic number, because the mean of its divisors is an integer number (78135668).

Almost surely, 2^648969129 is an apocalyptic number.

It is an amenable number.

648969129 is a deficient number, since it is larger than the sum of its proper divisors (288658887).

648969129 is a wasteful number, since it uses less digits than its factorization.

648969129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17556 (or 17553 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 648969129 is about 25474.8725021343. The cubic root of 648969129 is about 865.7809241793.

The spelling of 648969129 in words is "six hundred forty-eight million, nine hundred sixty-nine thousand, one hundred twenty-nine".