651542421 has 8 divisors (see below), whose sum is σ = 868965760. Its totient is φ = 434240352.

The previous prime is 651542387. The next prime is 651542429. The reversal of 651542421 is 124245156.

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

It is not a de Polignac number, because 651542421 - 2¹⁷ = 651411349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651542429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16936 + ... + 39873.

It is an arithmetic number, because the mean of its divisors is an integer number (108620720).

Almost surely, 2^651542421 is an apocalyptic number.

It is an amenable number.

651542421 is a deficient number, since it is larger than the sum of its proper divisors (217423339).

651542421 is a wasteful number, since it uses less digits than its factorization.

651542421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60635.

The product of its digits is 9600, while the sum is 30.

The square root of 651542421 is about 25525.3290086533. The cubic root of 651542421 is about 866.9237463351.

Adding to 651542421 its reverse (124245156), we get a palindrome (775787577).

The spelling of 651542421 in words is "six hundred fifty-one million, five hundred forty-two thousand, four hundred twenty-one".