1612128457 has 8 divisors (see below), whose sum is σ = 1640650536. Its totient is φ = 1583849472.

The previous prime is 1612128451. The next prime is 1612128481. The reversal of 1612128457 is 7548212161.

It can be written as a sum of positive squares in 4 ways, for example, as 438106761 + 1174021696 = 20931^2 + 34264^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1612128457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1612128451) by changing a digit.

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, 47368 + ... + 73945.

It is an arithmetic number, because the mean of its divisors is an integer number (205081317).

Almost surely, 2^1612128457 is an apocalyptic number.

It is an amenable number.

1612128457 is a deficient number, since it is larger than the sum of its proper divisors (28522079).

1612128457 is a wasteful number, since it uses less digits than its factorization.

1612128457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121547.

The product of its digits is 26880, while the sum is 37.

The square root of 1612128457 is about 40151.3194926393. The cubic root of 1612128457 is about 1172.5549778050.

The spelling of 1612128457 in words is "one billion, six hundred twelve million, one hundred twenty-eight thousand, four hundred fifty-seven".