2861277123961 has 3 divisors (see below), whose sum is σ = 2861278815493. Its totient is φ = 2861275432430.

The previous prime is 2861277123889. The next prime is 2861277123967. The reversal of 2861277123961 is 1693217721682.

The square root of 2861277123961 is 1691531.

It is a perfect power (a square), and thus also a powerful number.

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 is not a de Polignac number, because 2861277123961 - 2⁹ = 2861277123449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2861277123967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 845766 + ... + 2537296.

Almost surely, 2^{2861277123961} is an apocalyptic number.

2861277123961 is the 1691531-st square number.

2861277123961 is the 845766-th centered octagonal number.

It is an amenable number.

2861277123961 is a deficient number, since it is larger than the sum of its proper divisors (1691532).

2861277123961 is an frugal number, since it uses more digits than its factorization.

2861277123961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3383062 (or 1691531 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 55.

The spelling of 2861277123961 in words is "two trillion, eight hundred sixty-one billion, two hundred seventy-seven million, one hundred twenty-three thousand, nine hundred sixty-one".