1372784812281 has 9 divisors (see below), whose sum is σ = 1982916472719. Its totient is φ = 915187531536.

The previous prime is 1372784812261. The next prime is 1372784812283. The reversal of 1372784812281 is 1822184872731.

The square root of 1372784812281 is 1171659.

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

1372784812281 is a `hidden beast` number, since 1 + 3 + 72 + 78 + 481 + 2 + 28 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 431077599225 + 941707213056 = 656565^2 + 970416^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1372784812281 - 2⁷ = 1372784812153 is a prime.

It is a super-2 number, since 2×1372784812281² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1372784812283) 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, 3319701 + ... + 3710253.

Almost surely, 2^{1372784812281} is an apocalyptic number.

1372784812281 is the 1171659-th square number.

1372784812281 is the 585830-th centered octagonal number.

It is an amenable number.

1372784812281 is a deficient number, since it is larger than the sum of its proper divisors (610131660438).

1372784812281 is an frugal number, since it uses more digits than its factorization.

1372784812281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781112 (or 390556 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 54.

The spelling of 1372784812281 in words is "one trillion, three hundred seventy-two billion, seven hundred eighty-four million, eight hundred twelve thousand, two hundred eighty-one".