1261101940 has 48 divisors (see below), whose sum is σ = 3031459200. Its totient is φ = 431690112.

The previous prime is 1261101923. The next prime is 1261101943. The reversal of 1261101940 is 491011621.

It is a super-3 number, since 3×1261101940³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261101943) 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, 85426 + ... + 99094.

It is an arithmetic number, because the mean of its divisors is an integer number (63155400).

Almost surely, 2^1261101940 is an apocalyptic number.

1261101940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261101940 is an abundant number, since it is smaller than the sum of its proper divisors (1770357260).

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

1261101940 is a wasteful number, since it uses less digits than its factorization.

1261101940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14344 (or 14342 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1261101940 is about 35511.9971277314. The cubic root of 1261101940 is about 1080.3970705026.

The spelling of 1261101940 in words is "one billion, two hundred sixty-one million, one hundred one thousand, nine hundred forty".