31115401 has 2 divisors, whose sum is σ = 31115402. Its totient is φ = 31115400.

The previous prime is 31115393. The next prime is 31115417. The reversal of 31115401 is 10451113.

It is an a-pointer prime, because the next prime (31115417) can be obtained adding 31115401 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 423801 = 5540^2 + 651^2 .

It is an emirp because it is prime and its reverse (10451113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31115401 - 2³ = 31115393 is a prime.

It is not a weakly prime, because it can be changed into another prime (31115471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15557700 + 15557701.

It is an arithmetic number, because the mean of its divisors is an integer number (15557701).

Almost surely, 2^31115401 is an apocalyptic number.

It is an amenable number.

31115401 is a deficient number, since it is larger than the sum of its proper divisors (1).

31115401 is an equidigital number, since it uses as much as digits as its factorization.

31115401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 31115401 is about 5578.1180518164. The cubic root of 31115401 is about 314.5273873446.

Adding to 31115401 its reverse (10451113), we get a palindrome (41566514).

The spelling of 31115401 in words is "thirty-one million, one hundred fifteen thousand, four hundred one".