1491121762944 has 128 divisors (see below), whose sum is σ = 4346739694080. Its totient is φ = 449149148160.

The previous prime is 1491121762913. The next prime is 1491121762957. The reversal of 1491121762944 is 4492671211941.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×1491121762944² (a number of 25 digits) contains 22 as substring.

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, 351514 + ... + 1762329.

It is an arithmetic number, because the mean of its divisors is an integer number (33958903860).

Almost surely, 2^{1491121762944} is an apocalyptic number.

It is an amenable number.

1491121762944 is an abundant number, since it is smaller than the sum of its proper divisors (2855617931136).

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

1491121762944 is a wasteful number, since it uses less digits than its factorization.

1491121762944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114038 (or 2114026 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The spelling of 1491121762944 in words is "one trillion, four hundred ninety-one billion, one hundred twenty-one million, seven hundred sixty-two thousand, nine hundred forty-four".