1551650881 has 9 divisors (see below), whose sum is σ = 1706010019. Its totient is φ = 1410197800.

The previous prime is 1551650869. The next prime is 1551650927. The reversal of 1551650881 is 1880561551.

The square root of 1551650881 is 39391.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1383170481 + 168480400 = 37191^2 + 12980^2 .

It is not a de Polignac number, because 1551650881 - 2⁷ = 1551650753 is a prime.

It is a super-2 number, since 2×1551650881² = 4815240913016152322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551650801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 431511 + ... + 435091.

Almost surely, 2^1551650881 is an apocalyptic number.

1551650881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1551650881 is the 39391-st square number.

1551650881 is the 19696-th centered octagonal number.

It is an amenable number.

1551650881 is a deficient number, since it is larger than the sum of its proper divisors (154359138).

1551650881 is an frugal number, since it uses more digits than its factorization.

1551650881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7184 (or 3592 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 40.

The cubic root of 1551650881 is about 1157.7052536385.

The spelling of 1551650881 in words is "one billion, five hundred fifty-one million, six hundred fifty thousand, eight hundred eighty-one".