1620103551 has 8 divisors (see below), whose sum is σ = 2356514304. Its totient is φ = 981880920.

The previous prime is 1620103469. The next prime is 1620103559. The reversal of 1620103551 is 1553010261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1620103551 - 2¹⁷ = 1619972479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620103559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24546991 + ... + 24547056.

It is an arithmetic number, because the mean of its divisors is an integer number (294564288).

Almost surely, 2^1620103551 is an apocalyptic number.

1620103551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1620103551 is a deficient number, since it is larger than the sum of its proper divisors (736410753).

1620103551 is a wasteful number, since it uses less digits than its factorization.

1620103551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49094061.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1620103551 is about 40250.5099470802. The cubic root of 1620103551 is about 1174.4853157965.

It can be divided in two parts, 162010 and 3551, that added together give a palindrome (165561).

The spelling of 1620103551 in words is "one billion, six hundred twenty million, one hundred three thousand, five hundred fifty-one".