646023151 has 2 divisors, whose sum is σ = 646023152. Its totient is φ = 646023150.

The previous prime is 646023139. The next prime is 646023163. The reversal of 646023151 is 151320646.

It is a balanced prime because it is at equal distance from previous prime (646023139) and next prime (646023163).

It is a cyclic number.

It is not a de Polignac number, because 646023151 - 2⁹ = 646022639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646023121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323011575 + 323011576.

It is an arithmetic number, because the mean of its divisors is an integer number (323011576).

Almost surely, 2^646023151 is an apocalyptic number.

646023151 is a deficient number, since it is larger than the sum of its proper divisors (1).

646023151 is an equidigital number, since it uses as much as digits as its factorization.

646023151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 646023151 is about 25416.9854821535. The cubic root of 646023151 is about 864.4688737180.

Adding to 646023151 its reverse (151320646), we get a palindrome (797343797).

The spelling of 646023151 in words is "six hundred forty-six million, twenty-three thousand, one hundred fifty-one".