7139001515881 has 9 divisors (see below), whose sum is σ = 7309003440951. Its totient is φ = 6972866005392.

The previous prime is 7139001515869. The next prime is 7139001515903. The reversal of 7139001515881 is 1885151009317.

The square root of 7139001515881 is 2671891.

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., 5993707722025 + 1145293793856 = 2448205^2 + 1070184^2 .

It is not a de Polignac number, because 7139001515881 - 2¹³ = 7139001507689 is a prime.

It is a super-2 number, since 2×7139001515881² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7139001515801) 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, 114860245 + ... + 114922381.

It is an arithmetic number, because the mean of its divisors is an integer number (812111493439).

Almost surely, 2^{7139001515881} is an apocalyptic number.

7139001515881 is the 2671891-st square number.

7139001515881 is the 1335946-th centered octagonal number.

It is an amenable number.

7139001515881 is a deficient number, since it is larger than the sum of its proper divisors (170001925070).

7139001515881 is an frugal number, since it uses more digits than its factorization.

7139001515881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124360 (or 62180 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 49.

Multiplying 7139001515881 by its sum of digits (49), we get a square (349811074278169 = 18703237²).

The spelling of 7139001515881 in words is "seven trillion, one hundred thirty-nine billion, one million, five hundred fifteen thousand, eight hundred eighty-one".