1261541142 has 20 divisors (see below), whose sum is σ = 2826786996. Its totient is φ = 420513660.

The previous prime is 1261541137. The next prime is 1261541161. The reversal of 1261541142 is 2411451621.

1261541142 is a `hidden beast` number, since 1 + 2 + 615 + 4 + 1 + 1 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3893484 + ... + 3893807.

Almost surely, 2^1261541142 is an apocalyptic number.

1261541142 is an abundant number, since it is smaller than the sum of its proper divisors (1565245854).

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

1261541142 is an equidigital number, since it uses as much as digits as its factorization.

1261541142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7787305 (or 7787296 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1261541142 is about 35518.1804432603. The cubic root of 1261541142 is about 1080.5224786778.

Adding to 1261541142 its reverse (2411451621), we get a palindrome (3672992763).

The spelling of 1261541142 in words is "one billion, two hundred sixty-one million, five hundred forty-one thousand, one hundred forty-two".