1261684572 has 12 divisors (see below), whose sum is σ = 2943930696. Its totient is φ = 420561520.

The previous prime is 1261684537. The next prime is 1261684579. The reversal of 1261684572 is 2754861621.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×1261684572³ (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 (1261684579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52570179 + ... + 52570202.

It is an arithmetic number, because the mean of its divisors is an integer number (245327558).

Almost surely, 2^1261684572 is an apocalyptic number.

1261684572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1261684572 is an abundant number, since it is smaller than the sum of its proper divisors (1682246124).

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

1261684572 is a wasteful number, since it uses less digits than its factorization.

1261684572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105140388 (or 105140386 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 1261684572 is about 35520.1994926830. The cubic root of 1261684572 is about 1080.5634268643.

The spelling of 1261684572 in words is "one billion, two hundred sixty-one million, six hundred eighty-four thousand, five hundred seventy-two".