1291542516 has 96 divisors (see below), whose sum is σ = 3730728960. Its totient is φ = 383032800.

The previous prime is 1291542503. The next prime is 1291542541. The reversal of 1291542516 is 6152451921.

1291542516 is a `hidden beast` number, since 1 + 2 + 91 + 54 + 2 + 516 = 666.

It is a super-2 number, since 2×1291542516² = 3336164141271220512, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent 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, 44271 + ... + 67401.

It is an arithmetic number, because the mean of its divisors is an integer number (38861760).

Almost surely, 2^1291542516 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 1291542516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1865364480).

1291542516 is an abundant number, since it is smaller than the sum of its proper divisors (2439186444).

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

1291542516 is a wasteful number, since it uses less digits than its factorization.

1291542516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23202 (or 23194 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 1291542516 is about 35938.0371751157. The cubic root of 1291542516 is about 1089.0209529319.

The spelling of 1291542516 in words is "one billion, two hundred ninety-one million, five hundred forty-two thousand, five hundred sixteen".