646356047 has 2 divisors, whose sum is σ = 646356048. Its totient is φ = 646356046.

The previous prime is 646356037. The next prime is 646356101. The reversal of 646356047 is 740653646.

646356047 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 is a cyclic number.

It is not a de Polignac number, because 646356047 - 2²² = 642161743 is a prime.

It is a super-2 number, since 2×646356047² = 835552278986932418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646355995 and 646356013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646356037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323178023 + 323178024.

It is an arithmetic number, because the mean of its divisors is an integer number (323178024).

Almost surely, 2^646356047 is an apocalyptic number.

646356047 is a deficient number, since it is larger than the sum of its proper divisors (1).

646356047 is an equidigital number, since it uses as much as digits as its factorization.

646356047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 41.

The square root of 646356047 is about 25423.5333303615. The cubic root of 646356047 is about 864.6173352776.

The spelling of 646356047 in words is "six hundred forty-six million, three hundred fifty-six thousand, forty-seven".