15491430451 has 4 divisors (see below), whose sum is σ = 17704491952. Its totient is φ = 13278368952.

The previous prime is 15491430401. The next prime is 15491430499. The reversal of 15491430451 is 15403419451.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15491430451 - 2⁹ = 15491429939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15491430451.

It is not an unprimeable number, because it can be changed into a prime (15491430401) 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, 1106530740 + ... + 1106530753.

It is an arithmetic number, because the mean of its divisors is an integer number (4426122988).

Almost surely, 2^15491430451 is an apocalyptic number.

15491430451 is a deficient number, since it is larger than the sum of its proper divisors (2213061501).

15491430451 is an equidigital number, since it uses as much as digits as its factorization.

15491430451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213061500.

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

The spelling of 15491430451 in words is "fifteen billion, four hundred ninety-one million, four hundred thirty thousand, four hundred fifty-one".