15491019451 has 4 divisors (see below), whose sum is σ = 15491273392. Its totient is φ = 15490765512.

The previous prime is 15491019433. The next prime is 15491019457.

15491019451 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 15491019451 - 2¹⁵ = 15490986683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15491019457) 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, 25825 + ... + 177901.

It is an arithmetic number, because the mean of its divisors is an integer number (3872818348).

Almost surely, 2^15491019451 is an apocalyptic number.

15491019451 is a deficient number, since it is larger than the sum of its proper divisors (253941).

15491019451 is a wasteful number, since it uses less digits than its factorization.

15491019451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253940.

The product of its (nonzero) digits is 32400, while the sum is 40.

The spelling of 15491019451 in words is "fifteen billion, four hundred ninety-one million, nineteen thousand, four hundred fifty-one".