1261113501 has 16 divisors (see below), whose sum is σ = 1705032000. Its totient is φ = 829051008.

The previous prime is 1261113487. The next prime is 1261113521. The reversal of 1261113501 is 1053111621.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1261113501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261113521) 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, 51985 + ... + 72281.

It is an arithmetic number, because the mean of its divisors is an integer number (106564500).

Almost surely, 2^1261113501 is an apocalyptic number.

It is an amenable number.

1261113501 is a deficient number, since it is larger than the sum of its proper divisors (443918499).

1261113501 is a wasteful number, since it uses less digits than its factorization.

1261113501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20588.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 1261113501 is about 35512.1599033345. The cubic root of 1261113501 is about 1080.4003719625.

The spelling of 1261113501 in words is "one billion, two hundred sixty-one million, one hundred thirteen thousand, five hundred one".