1261376142 has 32 divisors (see below), whose sum is σ = 2859803520. Its totient is φ = 367688160.

The previous prime is 1261376113. The next prime is 1261376159. The reversal of 1261376142 is 2416731621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424084 + ... + 427047.

It is an arithmetic number, because the mean of its divisors is an integer number (89368860).

Almost surely, 2^1261376142 is an apocalyptic number.

1261376142 is an abundant number, since it is smaller than the sum of its proper divisors (1598427378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261376142 is a wasteful number, since it uses less digits than its factorization.

1261376142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851168.

The product of its digits is 12096, while the sum is 33.

The square root of 1261376142 is about 35515.8576131846. The cubic root of 1261376142 is about 1080.4753685793.

The spelling of 1261376142 in words is "one billion, two hundred sixty-one million, three hundred seventy-six thousand, one hundred forty-two".