31012405 has 4 divisors (see below), whose sum is σ = 37214892. Its totient is φ = 24809920.

The previous prime is 31012393. The next prime is 31012409. The reversal of 31012405 is 50421013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4726276 + 26286129 = 2174^2 + 5127^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31012405 is a prime.

It is a super-3 number, since 3×31012405³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012409) 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, 3101236 + ... + 3101245.

It is an arithmetic number, because the mean of its divisors is an integer number (9303723).

Almost surely, 2^31012405 is an apocalyptic number.

It is an amenable number.

31012405 is a deficient number, since it is larger than the sum of its proper divisors (6202487).

31012405 is an equidigital number, since it uses as much as digits as its factorization.

31012405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6202486.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 31012405 is about 5568.8782532930. The cubic root of 31012405 is about 314.1799616157.

Adding to 31012405 its reverse (50421013), we get a palindrome (81433418).

The spelling of 31012405 in words is "thirty-one million, twelve thousand, four hundred five".