31541340 has 48 divisors (see below), whose sum is σ = 88572960. Its totient is φ = 8386560.

The previous prime is 31541297. The next prime is 31541347. The reversal of 31541340 is 4314513.

It is a super-2 number, since 2×31541340² = 1989712257991200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31541347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30756 + ... + 31764.

It is an arithmetic number, because the mean of its divisors is an integer number (1845270).

Almost surely, 2^31541340 is an apocalyptic number.

31541340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31541340 is an abundant number, since it is smaller than the sum of its proper divisors (57031620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31541340 is a wasteful number, since it uses less digits than its factorization.

31541340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542 (or 1540 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 31541340 is about 5616.1677325379. The cubic root of 31541340 is about 315.9560773220.

Adding to 31541340 its reverse (4314513), we get a palindrome (35855853).

The spelling of 31541340 in words is "thirty-one million, five hundred forty-one thousand, three hundred forty".