2103151561 has 4 divisors (see below), whose sum is σ = 2403601792. Its totient is φ = 1802701332.

The previous prime is 2103151537. The next prime is 2103151571. The reversal of 2103151561 is 1651513012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2103151561 - 2¹³ = 2103143369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2103151511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150225105 + ... + 150225118.

It is an arithmetic number, because the mean of its divisors is an integer number (600900448).

Almost surely, 2^2103151561 is an apocalyptic number.

It is an amenable number.

2103151561 is a deficient number, since it is larger than the sum of its proper divisors (300450231).

2103151561 is an equidigital number, since it uses as much as digits as its factorization.

2103151561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300450230.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 2103151561 is about 45860.1304075773. The cubic root of 2103151561 is about 1281.2194516738.

Adding to 2103151561 its reverse (1651513012), we get a palindrome (3754664573).

It can be divided in two parts, 2103 and 151561, that added together give a square (153664 = 392²).

The spelling of 2103151561 in words is "two billion, one hundred three million, one hundred fifty-one thousand, five hundred sixty-one".