31154421 has 16 divisors (see below), whose sum is σ = 44117568. Its totient is φ = 19488000.

The previous prime is 31154401. The next prime is 31154423. The reversal of 31154421 is 12445113.

It is not a de Polignac number, because 31154421 - 2⁹ = 31153909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31154423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20746 + ... + 22196.

It is an arithmetic number, because the mean of its divisors is an integer number (2757348).

Almost surely, 2^31154421 is an apocalyptic number.

It is an amenable number.

31154421 is a deficient number, since it is larger than the sum of its proper divisors (12963147).

31154421 is a wasteful number, since it uses less digits than its factorization.

31154421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892.

The product of its digits is 480, while the sum is 21.

The square root of 31154421 is about 5581.6145513641. The cubic root of 31154421 is about 314.6588092086.

Adding to 31154421 its reverse (12445113), we get a palindrome (43599534).

The spelling of 31154421 in words is "thirty-one million, one hundred fifty-four thousand, four hundred twenty-one".