642737929 has 2 divisors, whose sum is σ = 642737930. Its totient is φ = 642737928.

The previous prime is 642737923. The next prime is 642737939. The reversal of 642737929 is 929737246.

It is a happy number.

642737929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 587577600 + 55160329 = 24240^2 + 7427^2 .

It is a cyclic number.

It is not a de Polignac number, because 642737929 - 2⁵ = 642737897 is a prime.

It is a super-2 number, since 2×642737929² = 826224090750418082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (642737923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321368964 + 321368965.

It is an arithmetic number, because the mean of its divisors is an integer number (321368965).

Almost surely, 2^642737929 is an apocalyptic number.

It is an amenable number.

642737929 is a deficient number, since it is larger than the sum of its proper divisors (1).

642737929 is an equidigital number, since it uses as much as digits as its factorization.

642737929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 49.

The square root of 642737929 is about 25352.2766038871. The cubic root of 642737929 is about 863.0010213446.

The spelling of 642737929 in words is "six hundred forty-two million, seven hundred thirty-seven thousand, nine hundred twenty-nine".