972745561 has 4 divisors (see below), whose sum is σ = 972836532. Its totient is φ = 972654592.

The previous prime is 972745549. The next prime is 972745583. The reversal of 972745561 is 165547279.

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 can be written as a sum of positive squares in 2 ways, for example, as 263055961 + 709689600 = 16219^2 + 26640^2 .

It is a cyclic number.

It is not a de Polignac number, because 972745561 - 2¹³ = 972737369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (972745531) 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, 26920 + ... + 51673.

It is an arithmetic number, because the mean of its divisors is an integer number (243209133).

Almost surely, 2^972745561 is an apocalyptic number.

It is an amenable number.

972745561 is a deficient number, since it is larger than the sum of its proper divisors (90971).

972745561 is a wasteful number, since it uses less digits than its factorization.

972745561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90970.

The product of its digits is 529200, while the sum is 46.

The square root of 972745561 is about 31188.8691843741. The cubic root of 972745561 is about 990.8313803290.

The spelling of 972745561 in words is "nine hundred seventy-two million, seven hundred forty-five thousand, five hundred sixty-one".