1261142461 has 8 divisors (see below), whose sum is σ = 1329073920. Its totient is φ = 1193366592.

The previous prime is 1261142453. The next prime is 1261142503. The reversal of 1261142461 is 1642411621.

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

It is not a de Polignac number, because 1261142461 - 2³ = 1261142453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261142431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22060 + ... + 54853.

It is an arithmetic number, because the mean of its divisors is an integer number (166134240).

Almost surely, 2^1261142461 is an apocalyptic number.

It is an amenable number.

1261142461 is a deficient number, since it is larger than the sum of its proper divisors (67931459).

1261142461 is an equidigital number, since it uses as much as digits as its factorization.

1261142461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77795.

The product of its digits is 2304, while the sum is 28.

The square root of 1261142461 is about 35512.5676486508. The cubic root of 1261142461 is about 1080.4086419438.

The spelling of 1261142461 in words is "one billion, two hundred sixty-one million, one hundred forty-two thousand, four hundred sixty-one".