15428321261 has 4 divisors (see below), whose sum is σ = 15428888832. Its totient is φ = 15427753692.

The previous prime is 15428321257. The next prime is 15428321297. The reversal of 15428321261 is 16212382451.

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 15428321261 - 2² = 15428321257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15428321221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240845 + ... + 298098.

It is an arithmetic number, because the mean of its divisors is an integer number (3857222208).

Almost surely, 2^15428321261 is an apocalyptic number.

It is an amenable number.

15428321261 is a deficient number, since it is larger than the sum of its proper divisors (567571).

15428321261 is an equidigital number, since it uses as much as digits as its factorization.

15428321261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567570.

The product of its digits is 23040, while the sum is 35.

The spelling of 15428321261 in words is "fifteen billion, four hundred twenty-eight million, three hundred twenty-one thousand, two hundred sixty-one".