1310121977 has 2 divisors, whose sum is σ = 1310121978. Its totient is φ = 1310121976.

The previous prime is 1310121971. The next prime is 1310122019. The reversal of 1310121977 is 7791210131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 787588096 + 522533881 = 28064^2 + 22859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1310121977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1310121971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655060988 + 655060989.

It is an arithmetic number, because the mean of its divisors is an integer number (655060989).

Almost surely, 2^1310121977 is an apocalyptic number.

It is an amenable number.

1310121977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1310121977 is an equidigital number, since it uses as much as digits as its factorization.

1310121977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2646, while the sum is 32.

The square root of 1310121977 is about 36195.6071505922. The cubic root of 1310121977 is about 1094.2181409467.

The spelling of 1310121977 in words is "one billion, three hundred ten million, one hundred twenty-one thousand, nine hundred seventy-seven".