651252021 has 8 divisors (see below), whose sum is σ = 992384064. Its totient is φ = 372144000.

The previous prime is 651251989. The next prime is 651252079. The reversal of 651252021 is 120252156.

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 651252021 - 2⁵ = 651251989 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 651251982 and 651252000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651252421) 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, 15505980 + ... + 15506021.

It is an arithmetic number, because the mean of its divisors is an integer number (124048008).

Almost surely, 2^651252021 is an apocalyptic number.

It is an amenable number.

651252021 is a deficient number, since it is larger than the sum of its proper divisors (341132043).

651252021 is a wasteful number, since it uses less digits than its factorization.

651252021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31012011.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 651252021 is about 25519.6399073341. The cubic root of 651252021 is about 866.7949278778.

The spelling of 651252021 in words is "six hundred fifty-one million, two hundred fifty-two thousand, twenty-one".