31433143440 has 40 divisors (see below), whose sum is σ = 97442745408. Its totient is φ = 8382171520.

The previous prime is 31433143433. The next prime is 31433143447. The reversal of 31433143440 is 4434133413.

It is an interprime number because it is at equal distance from previous prime (31433143433) and next prime (31433143447).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31433143398 and 31433143407.

It is not an unprimeable number, because it can be changed into a prime (31433143447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65485476 + ... + 65485955.

Almost surely, 2^31433143440 is an apocalyptic number.

31433143440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31433143440 is an abundant number, since it is smaller than the sum of its proper divisors (66009601968).

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

31433143440 is a wasteful number, since it uses less digits than its factorization.

31433143440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130971447 (or 130971441 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 31433143440 its reverse (4434133413), we get a palindrome (35867276853).

The spelling of 31433143440 in words is "thirty-one billion, four hundred thirty-three million, one hundred forty-three thousand, four hundred forty".