651212156 has 72 divisors (see below), whose sum is σ = 1456318080. Its totient is φ = 252872928.

The previous prime is 651212153. The next prime is 651212171.

It is a happy number.

651212156 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651212153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81851 + ... + 89453.

It is an arithmetic number, because the mean of its divisors is an integer number (20226640).

Almost surely, 2^651212156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651212156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728159040).

651212156 is an abundant number, since it is smaller than the sum of its proper divisors (805105924).

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

651212156 is a wasteful number, since it uses less digits than its factorization.

651212156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7663 (or 7654 counting only the distinct ones).

The product of its digits is 3600, while the sum is 29.

The square root of 651212156 is about 25518.8588302847. The cubic root of 651212156 is about 866.7772411842. Note that the first 3 decimals are identical.

The spelling of 651212156 in words is "six hundred fifty-one million, two hundred twelve thousand, one hundred fifty-six".