31213001 has 8 divisors (see below), whose sum is σ = 33621504. Its totient is φ = 28892160.

The previous prime is 31212899. The next prime is 31213009. The reversal of 31213001 is 10031213.

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 31213001 - 2¹⁰ = 31211977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213009) 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, 21176 + ... + 22601.

It is an arithmetic number, because the mean of its divisors is an integer number (4202688).

Almost surely, 2^31213001 is an apocalyptic number.

31213001 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31213001 is a deficient number, since it is larger than the sum of its proper divisors (2408503).

31213001 is a wasteful number, since it uses less digits than its factorization.

31213001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43831.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 31213001 is about 5586.8596724815. The cubic root of 31213001 is about 314.8559045317.

Adding to 31213001 its reverse (10031213), we get a palindrome (41244214).

The spelling of 31213001 in words is "thirty-one million, two hundred thirteen thousand, one".