31321601 has 4 divisors (see below), whose sum is σ = 31334100. Its totient is φ = 31309104.

The previous prime is 31321583. The next prime is 31321613. The reversal of 31321601 is 10612313.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10612313 = 263 ⋅40351.

It can be written as a sum of positive squares in 2 ways, for example, as 17631601 + 13690000 = 4199^2 + 3700^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321601 - 2²² = 27127297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31321601.

It is not an unprimeable number, because it can be changed into a prime (31321651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1046 + ... + 7983.

It is an arithmetic number, because the mean of its divisors is an integer number (7833525).

Almost surely, 2^31321601 is an apocalyptic number.

It is an amenable number.

31321601 is a deficient number, since it is larger than the sum of its proper divisors (12499).

31321601 is an equidigital number, since it uses as much as digits as its factorization.

31321601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12498.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 31321601 is about 5596.5704677061. The cubic root of 31321601 is about 315.2206432633.

Adding to 31321601 its reverse (10612313), we get a palindrome (41933914).

The spelling of 31321601 in words is "thirty-one million, three hundred twenty-one thousand, six hundred one".