651451020 has 96 divisors (see below), whose sum is σ = 2032321536. Its totient is φ = 154560000.

The previous prime is 651451013. The next prime is 651451027. The reversal of 651451020 is 20154156.

It is an interprime number because it is at equal distance from previous prime (651451013) and next prime (651451027).

It is not an unprimeable number, because it can be changed into a prime (651451027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20520 + ... + 41520.

It is an arithmetic number, because the mean of its divisors is an integer number (21170016).

Almost surely, 2^651451020 is an apocalyptic number.

651451020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651451020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1016160768).

651451020 is an abundant number, since it is smaller than the sum of its proper divisors (1380870516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651451020 is a wasteful number, since it uses less digits than its factorization.

651451020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21071 (or 21069 counting only the distinct ones).

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

The square root of 651451020 is about 25523.5385477798. The cubic root of 651451020 is about 866.8832059188.

The spelling of 651451020 in words is "six hundred fifty-one million, four hundred fifty-one thousand, twenty".