1516091651 has 4 divisors (see below), whose sum is σ = 1516225032. Its totient is φ = 1515958272.

The previous prime is 1516091627. The next prime is 1516091653. The reversal of 1516091651 is 1561906151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1561906151 = 13 ⋅120146627.

It is a cyclic number.

It is not a de Polignac number, because 1516091651 - 2⁶ = 1516091587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1516091653) 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, 47870 + ... + 72963.

It is an arithmetic number, because the mean of its divisors is an integer number (379056258).

Almost surely, 2^1516091651 is an apocalyptic number.

1516091651 is a deficient number, since it is larger than the sum of its proper divisors (133381).

1516091651 is a wasteful number, since it uses less digits than its factorization.

1516091651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133380.

The product of its (nonzero) digits is 8100, while the sum is 35.

The square root of 1516091651 is about 38937.0215989873. The cubic root of 1516091651 is about 1148.7931008112.

The spelling of 1516091651 in words is "one billion, five hundred sixteen million, ninety-one thousand, six hundred fifty-one".