1591553428 has 6 divisors (see below), whose sum is σ = 2785218506. Its totient is φ = 795776712.

The previous prime is 1591553387. The next prime is 1591553441. The reversal of 1591553428 is 8243551951.

It can be written as a sum of positive squares in only one way, i.e., 1378042884 + 213510544 = 37122^2 + 14612^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198944175 + ... + 198944182.

Almost surely, 2^1591553428 is an apocalyptic number.

It is an amenable number.

1591553428 is a deficient number, since it is larger than the sum of its proper divisors (1193665078).

1591553428 is a wasteful number, since it uses less digits than its factorization.

1591553428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397888361 (or 397888359 counting only the distinct ones).

The product of its digits is 216000, while the sum is 43.

The square root of 1591553428 is about 39894.2781360937. The cubic root of 1591553428 is about 1167.5453023458.

The spelling of 1591553428 in words is "one billion, five hundred ninety-one million, five hundred fifty-three thousand, four hundred twenty-eight".