31213401 has 8 divisors (see below), whose sum is σ = 41643744. Its totient is φ = 20796000.

The previous prime is 31213397. The next prime is 31213417. The reversal of 31213401 is 10431213.

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

It is not a de Polignac number, because 31213401 - 2² = 31213397 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31213201) 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, 7270 + ... + 10736.

It is an arithmetic number, because the mean of its divisors is an integer number (5205468).

Almost surely, 2^31213401 is an apocalyptic number.

It is an amenable number.

31213401 is a deficient number, since it is larger than the sum of its proper divisors (10430343).

31213401 is a wasteful number, since it uses less digits than its factorization.

31213401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6471.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 31213401 is about 5586.8954706527. The cubic root of 31213401 is about 314.8572495036.

Adding to 31213401 its reverse (10431213), we get a palindrome (41644614).

The spelling of 31213401 in words is "thirty-one million, two hundred thirteen thousand, four hundred one".