1516121551 has 16 divisors (see below), whose sum is σ = 1771896384. Its totient is φ = 1270324224.

The previous prime is 1516121539. The next prime is 1516121569. The reversal of 1516121551 is 1551216151.

It is a cyclic number.

It is not a de Polignac number, because 1516121551 - 2¹¹ = 1516119503 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 (1516121501) 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, 95391 + ... + 110143.

It is an arithmetic number, because the mean of its divisors is an integer number (110743524).

Almost surely, 2^1516121551 is an apocalyptic number.

1516121551 is a deficient number, since it is larger than the sum of its proper divisors (255774833).

1516121551 is a wasteful number, since it uses less digits than its factorization.

1516121551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15090.

The product of its digits is 1500, while the sum is 28.

The square root of 1516121551 is about 38937.4055504472. The cubic root of 1516121551 is about 1148.8006528366.

The spelling of 1516121551 in words is "one billion, five hundred sixteen million, one hundred twenty-one thousand, five hundred fifty-one".