651135121 has 8 divisors (see below), whose sum is σ = 801397184. Its totient is φ = 515183760.

The previous prime is 651135091. The next prime is 651135193. The reversal of 651135121 is 121531156.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 651135121 - 2⁷ = 651134993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (651130121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3577575 + ... + 3577756.

It is an arithmetic number, because the mean of its divisors is an integer number (100174648).

Almost surely, 2^651135121 is an apocalyptic number.

It is an amenable number.

651135121 is a deficient number, since it is larger than the sum of its proper divisors (150262063).

651135121 is a wasteful number, since it uses less digits than its factorization.

651135121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7155351.

The product of its digits is 900, while the sum is 25.

The square root of 651135121 is about 25517.3494117238. The cubic root of 651135121 is about 866.7430614282.

Adding to 651135121 its reverse (121531156), we get a palindrome (772666277).

The spelling of 651135121 in words is "six hundred fifty-one million, one hundred thirty-five thousand, one hundred twenty-one".