7197751945 has 4 divisors (see below), whose sum is σ = 8637302340. Its totient is φ = 5758201552.

The previous prime is 7197751943. The next prime is 7197751987. The reversal of 7197751945 is 5491577917.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5265534096 + 1932217849 = 72564^2 + 43957^2 .

It is a cyclic number.

It is not a de Polignac number, because 7197751945 - 2¹ = 7197751943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7197751943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719775190 + ... + 719775199.

It is an arithmetic number, because the mean of its divisors is an integer number (2159325585).

Almost surely, 2^7197751945 is an apocalyptic number.

It is an amenable number.

7197751945 is a deficient number, since it is larger than the sum of its proper divisors (1439550395).

7197751945 is a wasteful number, since it uses less digits than its factorization.

7197751945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439550394.

The product of its digits is 2778300, while the sum is 55.

The square root of 7197751945 is about 84839.5659170885. The cubic root of 7197751945 is about 1930.7777785471. Note that the first 5 decimals are identical.

The spelling of 7197751945 in words is "seven billion, one hundred ninety-seven million, seven hundred fifty-one thousand, nine hundred forty-five".