1381088569 has 9 divisors (see below), whose sum is σ = 1606875087. Its totient is φ = 1183567224.

The previous prime is 1381088557. The next prime is 1381088593. The reversal of 1381088569 is 9658801831.

The square root of 1381088569 is 37163.

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., 4678569 + 1376410000 = 2163^2 + 37100^2 .

It is not a de Polignac number, because 1381088569 - 2⁵ = 1381088537 is a prime.

It is a super-2 number, since 2×1381088569² = 3814811270844935522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381088519) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 257487 + ... + 262795.

Almost surely, 2^1381088569 is an apocalyptic number.

1381088569 is the 37163-rd square number.

1381088569 is the 18582-nd centered octagonal number.

It is an amenable number.

1381088569 is a deficient number, since it is larger than the sum of its proper divisors (225786518).

1381088569 is an frugal number, since it uses more digits than its factorization.

1381088569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10632 (or 5316 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 49.

The cubic root of 1381088569 is about 1113.6289445245.

Multiplying 1381088569 by its sum of digits (49), we get a square (67673339881 = 260141²).

1381088569 divided by its sum of digits (49) gives a square (28185481 = 5309²).

The spelling of 1381088569 in words is "one billion, three hundred eighty-one million, eighty-eight thousand, five hundred sixty-nine".