1139981154601 has 9 divisors (see below), whose sum is σ = 1164803409399. Its totient is φ = 1115677122264.

The previous prime is 1139981154577. The next prime is 1139981154607. The reversal of 1139981154601 is 1064511899311.

The square root of 1139981154601 is 1067699.

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., 384604627225 + 755376527376 = 620165^2 + 869124^2 .

It is not a de Polignac number, because 1139981154601 - 2¹⁷ = 1139981023529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1139981154607) 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, 50170495 + ... + 50193211.

Almost surely, 2^{1139981154601} is an apocalyptic number.

1139981154601 is the 1067699-th square number.

1139981154601 is the 533850-th centered octagonal number.

It is an amenable number.

1139981154601 is a deficient number, since it is larger than the sum of its proper divisors (24822254798).

1139981154601 is an frugal number, since it uses more digits than its factorization.

1139981154601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45528 (or 22764 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 49.

Multiplying 1139981154601 by its sum of digits (49), we get a square (55859076575449 = 7473893²).

The spelling of 1139981154601 in words is "one trillion, one hundred thirty-nine billion, nine hundred eighty-one million, one hundred fifty-four thousand, six hundred one".