1261211442 has 32 divisors (see below), whose sum is σ = 2601656064. Its totient is φ = 407376000.

The previous prime is 1261211429. The next prime is 1261211443. The reversal of 1261211442 is 2441121621.

It is not an unprimeable number, because it can be changed into a prime (1261211443) 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, 6342 + ... + 50622.

It is an arithmetic number, because the mean of its divisors is an integer number (81301752).

Almost surely, 2^1261211442 is an apocalyptic number.

1261211442 is an abundant number, since it is smaller than the sum of its proper divisors (1340444622).

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

1261211442 is a wasteful number, since it uses less digits than its factorization.

1261211442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44434.

The product of its digits is 768, while the sum is 24.

The square root of 1261211442 is about 35513.5388549212. The cubic root of 1261211442 is about 1080.4283400382.

The spelling of 1261211442 in words is "one billion, two hundred sixty-one million, two hundred eleven thousand, four hundred forty-two".