1261443542 has 8 divisors (see below), whose sum is σ = 1892689032. Its totient is φ = 630547200.

The previous prime is 1261443539. The next prime is 1261443559. The reversal of 1261443542 is 2453441621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1261443499 and 1261443508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78059 + ... + 92822.

It is an arithmetic number, because the mean of its divisors is an integer number (236586129).

Almost surely, 2^1261443542 is an apocalyptic number.

1261443542 is a deficient number, since it is larger than the sum of its proper divisors (631245490).

1261443542 is a wasteful number, since it uses less digits than its factorization.

1261443542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174574.

The product of its digits is 23040, while the sum is 32.

The square root of 1261443542 is about 35516.8064724294. The cubic root of 1261443542 is about 1080.4946128370.

The spelling of 1261443542 in words is "one billion, two hundred sixty-one million, four hundred forty-three thousand, five hundred forty-two".