1261443040942 has 16 divisors (see below), whose sum is σ = 2167467960672. Its totient is φ = 539369902080.

The previous prime is 1261443040933. The next prime is 1261443040951. The reversal of 1261443040942 is 2490403441621.

It is an interprime number because it is at equal distance from previous prime (1261443040933) and next prime (1261443040951).

It is a junction number, because it is equal to n+sod(n) for n = 1261443040895 and 1261443040904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104039059 + ... + 104051182.

It is an arithmetic number, because the mean of its divisors is an integer number (135466747542).

Almost surely, 2^{1261443040942} is an apocalyptic number.

1261443040942 is a deficient number, since it is larger than the sum of its proper divisors (906024919730).

1261443040942 is a wasteful number, since it uses less digits than its factorization.

1261443040942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208090683.

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 1261443040942 in words is "one trillion, two hundred sixty-one billion, four hundred forty-three million, forty thousand, nine hundred forty-two".