261121031083 has 16 divisors (see below), whose sum is σ = 286322964480. Its totient is φ = 236165220000.

The previous prime is 261121031029. The next prime is 261121031113. The reversal of 261121031083 is 380130121162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261121031083 - 2⁹ = 261121030571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261121031683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2367478 + ... + 2475316.

It is an arithmetic number, because the mean of its divisors is an integer number (17895185280).

Almost surely, 2^261121031083 is an apocalyptic number.

261121031083 is a deficient number, since it is larger than the sum of its proper divisors (25201933397).

261121031083 is a wasteful number, since it uses less digits than its factorization.

261121031083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108978.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 261121031083 in words is "two hundred sixty-one billion, one hundred twenty-one million, thirty-one thousand, eighty-three".