7138891505 has 16 divisors (see below), whose sum is σ = 8842635648. Its totient is φ = 5529264000.

The previous prime is 7138891471. The next prime is 7138891511. The reversal of 7138891505 is 5051988317.

It is a happy number.

It is not a de Polignac number, because 7138891505 - 2¹⁸ = 7138629361 is a prime.

It is a super-2 number, since 2×7138891505² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7138891505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106061 + ... + 159770.

It is an arithmetic number, because the mean of its divisors is an integer number (552664728).

Almost surely, 2^7138891505 is an apocalyptic number.

It is an amenable number.

7138891505 is a deficient number, since it is larger than the sum of its proper divisors (1703744143).

7138891505 is a wasteful number, since it uses less digits than its factorization.

7138891505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266008.

The product of its (nonzero) digits is 302400, while the sum is 47.

The square root of 7138891505 is about 84491.9611856655. The cubic root of 7138891505 is about 1925.5003145495.

The spelling of 7138891505 in words is "seven billion, one hundred thirty-eight million, eight hundred ninety-one thousand, five hundred five".