1491921053 has 8 divisors (see below), whose sum is σ = 1715263872. Its totient is φ = 1271131056.

The previous prime is 1491921043. The next prime is 1491921061. The reversal of 1491921053 is 3501291941.

It is a happy number.

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 1491921053 - 2²² = 1487726749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491921043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 636950 + ... + 639287.

It is an arithmetic number, because the mean of its divisors is an integer number (214407984).

Almost surely, 2^1491921053 is an apocalyptic number.

It is an amenable number.

1491921053 is a deficient number, since it is larger than the sum of its proper divisors (223342819).

1491921053 is a wasteful number, since it uses less digits than its factorization.

1491921053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276411.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1491921053 is about 38625.3938879593. The cubic root of 1491921053 is about 1142.6554116994.

The spelling of 1491921053 in words is "one billion, four hundred ninety-one million, nine hundred twenty-one thousand, fifty-three".