31150421 has 4 divisors (see below), whose sum is σ = 31162092. Its totient is φ = 31138752.

The previous prime is 31150397. The next prime is 31150429. The reversal of 31150421 is 12405113.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 18369796 + 12780625 = 4286^2 + 3575^2 .

It is a cyclic number.

It is not a de Polignac number, because 31150421 - 2¹⁰ = 31149397 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 31150421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31150429) 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, 365 + ... + 7901.

It is an arithmetic number, because the mean of its divisors is an integer number (7790523).

Almost surely, 2^31150421 is an apocalyptic number.

It is an amenable number.

31150421 is a deficient number, since it is larger than the sum of its proper divisors (11671).

31150421 is an equidigital number, since it uses as much as digits as its factorization.

31150421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11670.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 31150421 is about 5581.2562206012. The cubic root of 31150421 is about 314.6453420016.

Adding to 31150421 its reverse (12405113), we get a palindrome (43555534).

The spelling of 31150421 in words is "thirty-one million, one hundred fifty thousand, four hundred twenty-one".