7315551961 has 3 divisors (see below), whose sum is σ = 7315637493. Its totient is φ = 7315466430.

The previous prime is 7315551959. The next prime is 7315551989. The reversal of 7315551961 is 1691555137.

The square root of 7315551961 is 85531.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 7315551961 - 2¹ = 7315551959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7315551161) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 42766 + ... + 128296.

It is an arithmetic number, because the mean of its divisors is an integer number (2438545831).

Almost surely, 2^7315551961 is an apocalyptic number.

7315551961 is the 85531-st square number.

7315551961 is the 42766-th centered octagonal number.

It is an amenable number.

7315551961 is a deficient number, since it is larger than the sum of its proper divisors (85532).

7315551961 is an frugal number, since it uses more digits than its factorization.

7315551961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171062 (or 85531 counting only the distinct ones).

The product of its digits is 141750, while the sum is 43.

The cubic root of 7315551961 is about 1941.2540127183.

The spelling of 7315551961 in words is "seven billion, three hundred fifteen million, five hundred fifty-one thousand, nine hundred sixty-one".