1031661320 has 64 divisors (see below), whose sum is σ = 2564680320. Its totient is φ = 371497984.

The previous prime is 1031661317. The next prime is 1031661349. The reversal of 1031661320 is 231661301.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17342 + ... + 48621.

It is an arithmetic number, because the mean of its divisors is an integer number (40073130).

Almost surely, 2^1031661320 is an apocalyptic number.

1031661320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031661320 is an abundant number, since it is smaller than the sum of its proper divisors (1533019000).

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

1031661320 is a wasteful number, since it uses less digits than its factorization.

1031661320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66014 (or 66010 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1031661320 is about 32119.4850519120. The cubic root of 1031661320 is about 1010.4443099552. Note that the first 3 decimals are identical.

The spelling of 1031661320 in words is "one billion, thirty-one million, six hundred sixty-one thousand, three hundred twenty".