31261240001601 has 16 divisors (see below), whose sum is σ = 46388499477120. Its totient is φ = 20806828570800.

The previous prime is 31261240001599. The next prime is 31261240001617. The reversal of 31261240001601 is 10610004216213.

It is a happy number.

31261240001601 is a `hidden beast` number, since 3 + 1 + 2 + 6 + 12 + 40 + 0 + 0 + 1 + 601 = 666.

It is not a de Polignac number, because 31261240001601 - 2¹ = 31261240001599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31261240001681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944374725 + ... + 944407826.

It is an arithmetic number, because the mean of its divisors is an integer number (2899281217320).

Almost surely, 2^{31261240001601} is an apocalyptic number.

It is an amenable number.

31261240001601 is a deficient number, since it is larger than the sum of its proper divisors (15127259475519).

31261240001601 is a wasteful number, since it uses less digits than its factorization.

31261240001601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888783173 (or 1888783167 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 31261240001601 its reverse (10610004216213), we get a palindrome (41871244217814).

The spelling of 31261240001601 in words is "thirty-one trillion, two hundred sixty-one billion, two hundred forty million, one thousand, six hundred one".