651421233 has 12 divisors (see below), whose sum is σ = 962824720. Its totient is φ = 424181016.

The previous prime is 651421231. The next prime is 651421261. The reversal of 651421233 is 332124156.

651421233 is a `hidden beast` number, since 6 + 5 + 1 + 421 + 233 = 666.

It is not a de Polignac number, because 651421233 - 2¹ = 651421231 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 651421197 and 651421206.

It is not an unprimeable number, because it can be changed into a prime (651421231) 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, 841243 + ... + 842016.

Almost surely, 2^651421233 is an apocalyptic number.

It is an amenable number.

651421233 is a deficient number, since it is larger than the sum of its proper divisors (311403487).

651421233 is a wasteful number, since it uses less digits than its factorization.

651421233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683308 (or 1683305 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 651421233 is about 25522.9550209219. The cubic root of 651421233 is about 866.8699932378.

Adding to 651421233 its reverse (332124156), we get a palindrome (983545389).

It can be divided in two parts, 6514212 and 33, that added together give a triangular number (6514245 = T₃₆₀₉).

The spelling of 651421233 in words is "six hundred fifty-one million, four hundred twenty-one thousand, two hundred thirty-three".