31404261 has 16 divisors (see below), whose sum is σ = 47932544. Its totient is φ = 17915904.

The previous prime is 31404259. The next prime is 31404277. The reversal of 31404261 is 16240413.

It is not a de Polignac number, because 31404261 - 2¹ = 31404259 is a prime.

It is a super-2 number, since 2×31404261² = 1972455217912242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31404211) 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, 23565 + ... + 24861.

It is an arithmetic number, because the mean of its divisors is an integer number (2995784).

Almost surely, 2^31404261 is an apocalyptic number.

It is an amenable number.

31404261 is a deficient number, since it is larger than the sum of its proper divisors (16528283).

31404261 is a wasteful number, since it uses less digits than its factorization.

31404261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 31404261 is about 5603.9504815799. The cubic root of 31404261 is about 315.4976964761.

Adding to 31404261 its reverse (16240413), we get a palindrome (47644674).

The spelling of 31404261 in words is "thirty-one million, four hundred four thousand, two hundred sixty-one".