115551520121315 has 4 divisors (see below), whose sum is σ = 138661824145584. Its totient is φ = 92441216097048.

The previous prime is 115551520121309. The next prime is 115551520121339. The reversal of 115551520121315 is 513121025155511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 115551520121315 - 2⁴ = 115551520121299 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11555152012127 + ... + 11555152012136.

It is an arithmetic number, because the mean of its divisors is an integer number (34665456036396).

Almost surely, 2^{115551520121315} is an apocalyptic number.

115551520121315 is a deficient number, since it is larger than the sum of its proper divisors (23110304024269).

115551520121315 is an equidigital number, since it uses as much as digits as its factorization.

115551520121315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23110304024268.

The product of its (nonzero) digits is 37500, while the sum is 38.

Adding to 115551520121315 its reverse (513121025155511), we get a palindrome (628672545276826).

The spelling of 115551520121315 in words is "one hundred fifteen trillion, five hundred fifty-one billion, five hundred twenty million, one hundred twenty-one thousand, three hundred fifteen".