31555043401440 has 192 divisors, whose sum is σ = 107047572420096. Its totient is φ = 7767166298112.

The previous prime is 31555043401403. The next prime is 31555043401447. The reversal of 31555043401440 is 4410434055513.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31555043401447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 325573467 + ... + 325670373.

It is an arithmetic number, because the mean of its divisors is an integer number (557539439688).

Almost surely, 2^{31555043401440} is an apocalyptic number.

31555043401440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31555043401440 is an abundant number, since it is smaller than the sum of its proper divisors (75492529018656).

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

31555043401440 is a wasteful number, since it uses less digits than its factorization.

31555043401440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149121 (or 149113 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 31555043401440 its reverse (4410434055513), we get a palindrome (35965477456953).

The spelling of 31555043401440 in words is "thirty-one trillion, five hundred fifty-five billion, forty-three million, four hundred one thousand, four hundred forty".