261972609031 has 8 divisors (see below), whose sum is σ = 301551205760. Its totient is φ = 222932496888.

The previous prime is 261972609001. The next prime is 261972609089. The reversal of 261972609031 is 130906279162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261972609031 - 2⁷ = 261972608903 is a prime.

It is a super-2 number, since 2×261972609031² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261972609001) 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, 134620101 + ... + 134622046.

It is an arithmetic number, because the mean of its divisors is an integer number (37693900720).

Almost surely, 2^261972609031 is an apocalyptic number.

261972609031 is a deficient number, since it is larger than the sum of its proper divisors (39578596729).

261972609031 is a wasteful number, since it uses less digits than its factorization.

261972609031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269242293.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 261972609031 in words is "two hundred sixty-one billion, nine hundred seventy-two million, six hundred nine thousand, thirty-one".