1261640108 has 24 divisors (see below), whose sum is σ = 2413160064. Its totient is φ = 574560000.

The previous prime is 1261640101. The next prime is 1261640111. The reversal of 1261640108 is 8010461621.

It is a super-3 number, since 3×1261640108³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1261640101) 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, 297143 + ... + 301358.

It is an arithmetic number, because the mean of its divisors is an integer number (100548336).

Almost surely, 2^1261640108 is an apocalyptic number.

It is an amenable number.

1261640108 is a deficient number, since it is larger than the sum of its proper divisors (1151519956).

1261640108 is a wasteful number, since it uses less digits than its factorization.

1261640108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598553 (or 598551 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 1261640108 is about 35519.5735897829. The cubic root of 1261640108 is about 1080.5507330586.

The spelling of 1261640108 in words is "one billion, two hundred sixty-one million, six hundred forty thousand, one hundred eight".