1261541360 has 40 divisors (see below), whose sum is σ = 2934562176. Its totient is φ = 504362240.

The previous prime is 1261541339. The next prime is 1261541387. The reversal of 1261541360 is 631451621.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303617 + ... + 307743.

Almost surely, 2^1261541360 is an apocalyptic number.

1261541360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261541360 is an abundant number, since it is smaller than the sum of its proper divisors (1673020816).

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

1261541360 is a wasteful number, since it uses less digits than its factorization.

1261541360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7961 (or 7955 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1261541360 is about 35518.1835121111. The cubic root of 1261541360 is about 1080.5225409175.

Adding to 1261541360 its reverse (631451621), we get a palindrome (1892992981).

The spelling of 1261541360 in words is "one billion, two hundred sixty-one million, five hundred forty-one thousand, three hundred sixty".