4951561530 has 64 divisors (see below), whose sum is σ = 12157643520. Its totient is φ = 1290318336.

The previous prime is 4951561493. The next prime is 4951561543. The reversal of 4951561530 is 351651594.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228339 + ... + 249081.

It is an arithmetic number, because the mean of its divisors is an integer number (189963180).

Almost surely, 2^4951561530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4951561530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6078821760).

4951561530 is an abundant number, since it is smaller than the sum of its proper divisors (7206081990).

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

4951561530 is a wasteful number, since it uses less digits than its factorization.

4951561530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20935.

The product of its (nonzero) digits is 81000, while the sum is 39.

The square root of 4951561530 is about 70367.3328327854. The cubic root of 4951561530 is about 1704.4361106580.

The spelling of 4951561530 in words is "four billion, nine hundred fifty-one million, five hundred sixty-one thousand, five hundred thirty".