651330121 has 4 divisors (see below), whose sum is σ = 701432452. Its totient is φ = 601227792.

The previous prime is 651330103. The next prime is 651330157. The reversal of 651330121 is 121033156.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 213014025 + 438316096 = 14595^2 + 20936^2 .

It is a cyclic number.

It is not a de Polignac number, because 651330121 - 2¹⁷ = 651199049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 651330092 and 651330101.

It is not an unprimeable number, because it can be changed into a prime (651330161) 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, 25051146 + ... + 25051171.

It is an arithmetic number, because the mean of its divisors is an integer number (175358113).

Almost surely, 2^651330121 is an apocalyptic number.

It is an amenable number.

651330121 is a deficient number, since it is larger than the sum of its proper divisors (50102331).

651330121 is a wasteful number, since it uses less digits than its factorization.

651330121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50102330.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 651330121 is about 25521.1700554657. The cubic root of 651330121 is about 866.8295759996.

Adding to 651330121 its reverse (121033156), we get a palindrome (772363277).

The spelling of 651330121 in words is "six hundred fifty-one million, three hundred thirty thousand, one hundred twenty-one".