3121263661501 has 2 divisors, whose sum is σ = 3121263661502. Its totient is φ = 3121263661500.

The previous prime is 3121263661493. The next prime is 3121263661519. The reversal of 3121263661501 is 1051663621213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2799832492900 + 321431168601 = 1673270^2 + 566949^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121263661501 - 2³ = 3121263661493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121263661601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560631830750 + 1560631830751.

It is an arithmetic number, because the mean of its divisors is an integer number (1560631830751).

Almost surely, 2^{3121263661501} is an apocalyptic number.

It is an amenable number.

3121263661501 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121263661501 is an equidigital number, since it uses as much as digits as its factorization.

3121263661501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 3121263661501 in words is "three trillion, one hundred twenty-one billion, two hundred sixty-three million, six hundred sixty-one thousand, five hundred one".