1516551391 has 16 divisors (see below), whose sum is σ = 1629771264. Its totient is φ = 1407710304.

The previous prime is 1516551371. The next prime is 1516551431. The reversal of 1516551391 is 1931556151.

It is a cyclic number.

It is not a de Polignac number, because 1516551391 - 2⁵ = 1516551359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1516551391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1516551331) 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 15 ways as a sum of consecutive naturals, for example, 150390 + ... + 160156.

It is an arithmetic number, because the mean of its divisors is an integer number (101860704).

Almost surely, 2^1516551391 is an apocalyptic number.

1516551391 is a deficient number, since it is larger than the sum of its proper divisors (113219873).

1516551391 is a wasteful number, since it uses less digits than its factorization.

1516551391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9990.

The product of its digits is 20250, while the sum is 37.

The square root of 1516551391 is about 38942.9247874373. The cubic root of 1516551391 is about 1148.9092091753.

The spelling of 1516551391 in words is "one billion, five hundred sixteen million, five hundred fifty-one thousand, three hundred ninety-one".