115721051 has 4 divisors (see below), whose sum is σ = 116269704. Its totient is φ = 115172400.

The previous prime is 115721033. The next prime is 115721069. The reversal of 115721051 is 150127511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150127511 = 101 ⋅1486411.

It is an interprime number because it is at equal distance from previous prime (115721033) and next prime (115721069).

It is a cyclic number.

It is not a de Polignac number, because 115721051 - 2¹⁰ = 115720027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115721251) 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, 274010 + ... + 274431.

It is an arithmetic number, because the mean of its divisors is an integer number (29067426).

Almost surely, 2^115721051 is an apocalyptic number.

115721051 is a deficient number, since it is larger than the sum of its proper divisors (548653).

115721051 is an equidigital number, since it uses as much as digits as its factorization.

115721051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548652.

The product of its (nonzero) digits is 350, while the sum is 23.

The square root of 115721051 is about 10757.3719374204. The cubic root of 115721051 is about 487.3086530223.

Adding to 115721051 its reverse (150127511), we get a palindrome (265848562).

The spelling of 115721051 in words is "one hundred fifteen million, seven hundred twenty-one thousand, fifty-one".