1537121656 has 32 divisors (see below), whose sum is σ = 3310575840. Its totient is φ = 655417728.

The previous prime is 1537121617. The next prime is 1537121659. The reversal of 1537121656 is 6561217351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1537121659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58635 + ... + 80698.

It is an arithmetic number, because the mean of its divisors is an integer number (103455495).

Almost surely, 2^1537121656 is an apocalyptic number.

It is an amenable number.

1537121656 is an abundant number, since it is smaller than the sum of its proper divisors (1773454184).

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

1537121656 is a wasteful number, since it uses less digits than its factorization.

1537121656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139543 (or 139539 counting only the distinct ones).

The product of its digits is 37800, while the sum is 37.

The square root of 1537121656 is about 39206.1430900822. The cubic root of 1537121656 is about 1154.0804399733.

The spelling of 1537121656 in words is "one billion, five hundred thirty-seven million, one hundred twenty-one thousand, six hundred fifty-six".