515151423121 has 4 divisors (see below), whose sum is σ = 515967828544. Its totient is φ = 514335017700.

The previous prime is 515151423053. The next prime is 515151423131. The reversal of 515151423121 is 121324151515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 515151423121 - 2²³ = 515143034513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (515151423131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408201765 + ... + 408203026.

It is an arithmetic number, because the mean of its divisors is an integer number (128991957136).

Almost surely, 2^515151423121 is an apocalyptic number.

It is an amenable number.

515151423121 is a deficient number, since it is larger than the sum of its proper divisors (816405423).

515151423121 is an equidigital number, since it uses as much as digits as its factorization.

515151423121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816405422.

The product of its digits is 6000, while the sum is 31.

Adding to 515151423121 its reverse (121324151515), we get a palindrome (636475574636).

The spelling of 515151423121 in words is "five hundred fifteen billion, one hundred fifty-one million, four hundred twenty-three thousand, one hundred twenty-one".