1381948366969 has 9 divisors (see below), whose sum is σ = 1389373924239. Its totient is φ = 1374562304640.

The previous prime is 1381948366951. The next prime is 1381948366973. The reversal of 1381948366969 is 9696638491831.

The square root of 1381948366969 is 1175563.

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., 334830036025 + 1047118330944 = 578645^2 + 1023288^2 .

It is not a de Polignac number, because 1381948366969 - 2²⁹ = 1381411496057 is a prime.

It is a super-2 number, since 2×1381948366969² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1391948366969) 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, 226880614 + ... + 226886704.

It is an arithmetic number, because the mean of its divisors is an integer number (154374880471).

Almost surely, 2^{1381948366969} is an apocalyptic number.

1381948366969 is the 1175563-rd square number.

1381948366969 is the 587782-nd centered octagonal number.

It is an amenable number.

1381948366969 is a deficient number, since it is larger than the sum of its proper divisors (7425557270).

1381948366969 is an frugal number, since it uses more digits than its factorization.

1381948366969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12568 (or 6284 counting only the distinct ones).

The product of its digits is 362797056, while the sum is 73.

The spelling of 1381948366969 in words is "one trillion, three hundred eighty-one billion, nine hundred forty-eight million, three hundred sixty-six thousand, nine hundred sixty-nine".