2168972957 has 2 divisors, whose sum is σ = 2168972958. Its totient is φ = 2168972956.

The previous prime is 2168972951. The next prime is 2168973013. The reversal of 2168972957 is 7592798612.

2168972957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (2168973013) can be obtained adding 2168972957 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1488493561 + 680479396 = 38581^2 + 26086^2 .

It is a cyclic number.

It is not a de Polignac number, because 2168972957 - 2¹² = 2168968861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2168972951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084486478 + 1084486479.

It is an arithmetic number, because the mean of its divisors is an integer number (1084486479).

Almost surely, 2^2168972957 is an apocalyptic number.

It is an amenable number.

2168972957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168972957 is an equidigital number, since it uses as much as digits as its factorization.

2168972957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The square root of 2168972957 is about 46572.2337557476. The cubic root of 2168972957 is about 1294.4483087047.

The spelling of 2168972957 in words is "two billion, one hundred sixty-eight million, nine hundred seventy-two thousand, nine hundred fifty-seven".