1291481272 has 8 divisors (see below), whose sum is σ = 2421527400. Its totient is φ = 645740632.

The previous prime is 1291481251. The next prime is 1291481287. The reversal of 1291481272 is 2721841921.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80717572 + ... + 80717587.

It is an arithmetic number, because the mean of its divisors is an integer number (302690925).

Almost surely, 2^1291481272 is an apocalyptic number.

It is an amenable number.

1291481272 is a deficient number, since it is larger than the sum of its proper divisors (1130046128).

1291481272 is a wasteful number, since it uses less digits than its factorization.

1291481272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161435165 (or 161435161 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 1291481272 is about 35937.1850873159. The cubic root of 1291481272 is about 1089.0037391345.

The spelling of 1291481272 in words is "one billion, two hundred ninety-one million, four hundred eighty-one thousand, two hundred seventy-two".