1491050057081 has 8 divisors (see below), whose sum is σ = 1622300301384. Its totient is φ = 1362164682240.

The previous prime is 1491050057051. The next prime is 1491050057117. The reversal of 1491050057081 is 1807500501941.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 248402560000 + 1242647497081 = 498400^2 + 1114741^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1491050057081 - 2⁶ = 1491050057017 is a prime.

It is a super-2 number, since 2×1491050057081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1491050057051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591216050 + ... + 591218571.

It is an arithmetic number, because the mean of its divisors is an integer number (202787537673).

Almost surely, 2^{1491050057081} is an apocalyptic number.

It is an amenable number.

1491050057081 is a deficient number, since it is larger than the sum of its proper divisors (131250244303).

1491050057081 is a wasteful number, since it uses less digits than its factorization.

1491050057081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182434731.

The product of its (nonzero) digits is 50400, while the sum is 41.

The spelling of 1491050057081 in words is "one trillion, four hundred ninety-one billion, fifty million, fifty-seven thousand, eighty-one".