1641251540 has 48 divisors (see below), whose sum is σ = 3647185920. Its totient is φ = 618664320.

The previous prime is 1641251531. The next prime is 1641251551. The reversal of 1641251540 is 451521461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61274 + ... + 83886.

It is an arithmetic number, because the mean of its divisors is an integer number (75983040).

Almost surely, 2^1641251540 is an apocalyptic number.

1641251540 is a gapful number since it is divisible by the number (10) 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 1641251540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1823592960).

1641251540 is an abundant number, since it is smaller than the sum of its proper divisors (2005934380).

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

1641251540 is a wasteful number, since it uses less digits than its factorization.

1641251540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22832 (or 22830 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1641251540 is about 40512.3628044576. The cubic root of 1641251540 is about 1179.5736130626.

The spelling of 1641251540 in words is "one billion, six hundred forty-one million, two hundred fifty-one thousand, five hundred forty".