1551055620 has 48 divisors (see below), whose sum is σ = 4350846528. Its totient is φ = 412863360.

The previous prime is 1551055609. The next prime is 1551055621. The reversal of 1551055620 is 265501551.

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

It is not an unprimeable number, because it can be changed into a prime (1551055621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10215 + ... + 56625.

It is an arithmetic number, because the mean of its divisors is an integer number (90642636).

Almost surely, 2^1551055620 is an apocalyptic number.

1551055620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551055620 is an abundant number, since it is smaller than the sum of its proper divisors (2799790908).

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

1551055620 is a wasteful number, since it uses less digits than its factorization.

1551055620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46980 (or 46978 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 1551055620 is about 39383.4434756536. The cubic root of 1551055620 is about 1157.5571909227.

The spelling of 1551055620 in words is "one billion, five hundred fifty-one million, fifty-five thousand, six hundred twenty".