972311261 has 2 divisors, whose sum is σ = 972311262. Its totient is φ = 972311260.

The previous prime is 972311257. The next prime is 972311267. The reversal of 972311261 is 162113279.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 870604036 + 101707225 = 29506^2 + 10085^2 .

It is an emirp because it is prime and its reverse (162113279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 972311261 - 2² = 972311257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (972311267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486155630 + 486155631.

It is an arithmetic number, because the mean of its divisors is an integer number (486155631).

Almost surely, 2^972311261 is an apocalyptic number.

It is an amenable number.

972311261 is a deficient number, since it is larger than the sum of its proper divisors (1).

972311261 is an equidigital number, since it uses as much as digits as its factorization.

972311261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 972311261 is about 31181.9059872869. The cubic root of 972311261 is about 990.6839001304.

The spelling of 972311261 in words is "nine hundred seventy-two million, three hundred eleven thousand, two hundred sixty-one".