646236121 has 4 divisors (see below), whose sum is σ = 661264912. Its totient is φ = 631207332.

The previous prime is 646236119. The next prime is 646236127. The reversal of 646236121 is 121632646.

646236121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121632646 = 2 ⋅60816323.

It is a cyclic number.

It is not a de Polignac number, because 646236121 - 2¹ = 646236119 is a prime.

It is a super-2 number, since 2×646236121² = 835242248170253282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646236127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7514331 + ... + 7514416.

It is an arithmetic number, because the mean of its divisors is an integer number (165316228).

Almost surely, 2^646236121 is an apocalyptic number.

It is an amenable number.

646236121 is a deficient number, since it is larger than the sum of its proper divisors (15028791).

646236121 is a wasteful number, since it uses less digits than its factorization.

646236121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15028790.

The product of its digits is 10368, while the sum is 31.

The square root of 646236121 is about 25421.1746581467. The cubic root of 646236121 is about 864.5638577798.

Adding to 646236121 its reverse (121632646), we get a palindrome (767868767).

The spelling of 646236121 in words is "six hundred forty-six million, two hundred thirty-six thousand, one hundred twenty-one".