7145991551 has 4 divisors (see below), whose sum is σ = 7161628752. Its totient is φ = 7130354352.

The previous prime is 7145991547. The next prime is 7145991563. The reversal of 7145991551 is 1551995417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1551995417 = 7 ⋅221713631.

It is a cyclic number.

It is not a de Polignac number, because 7145991551 - 2² = 7145991547 is a prime.

It is a super-3 number, since 3×7145991551³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7145991496 and 7145991505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7145991521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7817915 + ... + 7818828.

It is an arithmetic number, because the mean of its divisors is an integer number (1790407188).

Almost surely, 2^7145991551 is an apocalyptic number.

7145991551 is a deficient number, since it is larger than the sum of its proper divisors (15637201).

7145991551 is a wasteful number, since it uses less digits than its factorization.

7145991551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15637200.

The product of its digits is 283500, while the sum is 47.

The square root of 7145991551 is about 84533.9668476524. The cubic root of 7145991551 is about 1926.1384440149.

The spelling of 7145991551 in words is "seven billion, one hundred forty-five million, nine hundred ninety-one thousand, five hundred fifty-one".