1291887052 has 24 divisors (see below), whose sum is σ = 2395008000. Its totient is φ = 607637760.

The previous prime is 1291887049. The next prime is 1291887071. The reversal of 1291887052 is 2507881921.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183477 + ... + 190387.

It is an arithmetic number, because the mean of its divisors is an integer number (99792000).

Almost surely, 2^1291887052 is an apocalyptic number.

It is an amenable number.

1291887052 is a deficient number, since it is larger than the sum of its proper divisors (1103120948).

1291887052 is a wasteful number, since it uses less digits than its factorization.

1291887052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9681 (or 9679 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 1291887052 is about 35942.8303281753. The cubic root of 1291887052 is about 1089.1177812230.

The spelling of 1291887052 in words is "one billion, two hundred ninety-one million, eight hundred eighty-seven thousand, fifty-two".