1261522140 has 48 divisors (see below), whose sum is σ = 3559248000. Its totient is φ = 333835840.

The previous prime is 1261522139. The next prime is 1261522187. The reversal of 1261522140 is 412251621.

It is a self number, because there is not a number n which added to its sum of digits gives 1261522140.

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, 72390 + ... + 88109.

It is an arithmetic number, because the mean of its divisors is an integer number (74151000).

Almost surely, 2^1261522140 is an apocalyptic number.

1261522140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261522140 is an abundant number, since it is smaller than the sum of its proper divisors (2297725860).

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

1261522140 is a wasteful number, since it uses less digits than its factorization.

1261522140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160642 (or 160640 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1261522140 is about 35517.9129454421. The cubic root of 1261522140 is about 1080.5170535168.

Adding to 1261522140 its reverse (412251621), we get a palindrome (1673773761).

The spelling of 1261522140 in words is "one billion, two hundred sixty-one million, five hundred twenty-two thousand, one hundred forty".