31601261 has 8 divisors (see below), whose sum is σ = 32076000. Its totient is φ = 31130320.

The previous prime is 31601203. The next prime is 31601263. The reversal of 31601261 is 16210613.

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 31601261 - 2²² = 27406957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31601263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18710 + ... + 20328.

It is an arithmetic number, because the mean of its divisors is an integer number (4009500).

Almost surely, 2^31601261 is an apocalyptic number.

It is an amenable number.

31601261 is a deficient number, since it is larger than the sum of its proper divisors (474739).

31601261 is a wasteful number, since it uses less digits than its factorization.

31601261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 31601261 is about 5621.4998888197. The cubic root of 31601261 is about 316.1560310730.

Adding to 31601261 its reverse (16210613), we get a palindrome (47811874).

The spelling of 31601261 in words is "thirty-one million, six hundred one thousand, two hundred sixty-one".