1351665820 has 48 divisors (see below), whose sum is σ = 2862488160. Its totient is φ = 536120064.

The previous prime is 1351665811. The next prime is 1351665823. The reversal of 1351665820 is 285661531.

It is a self number, because there is not a number n which added to its sum of digits gives 1351665820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351665823) 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, 1489807 + ... + 1490713.

It is an arithmetic number, because the mean of its divisors is an integer number (59635170).

Almost surely, 2^1351665820 is an apocalyptic number.

1351665820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1351665820 is an abundant number, since it is smaller than the sum of its proper divisors (1510822340).

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

1351665820 is a wasteful number, since it uses less digits than its factorization.

1351665820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1462 (or 1460 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 1351665820 is about 36765.0080919344. The cubic root of 1351665820 is about 1105.6638503977.

The spelling of 1351665820 in words is "one billion, three hundred fifty-one million, six hundred sixty-five thousand, eight hundred twenty".