515151201023 has 4 divisors (see below), whose sum is σ = 515183472408. Its totient is φ = 515118929640.

The previous prime is 515151201007. The next prime is 515151201031. The reversal of 515151201023 is 320102151515.

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 515151201023 - 2⁴ = 515151201007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 515151200983 and 515151201001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515151201043) 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, 16111736 + ... + 16143677.

It is an arithmetic number, because the mean of its divisors is an integer number (128795868102).

Almost surely, 2^515151201023 is an apocalyptic number.

515151201023 is a deficient number, since it is larger than the sum of its proper divisors (32271385).

515151201023 is a wasteful number, since it uses less digits than its factorization.

515151201023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32271384.

The product of its (nonzero) digits is 1500, while the sum is 26.

Adding to 515151201023 its reverse (320102151515), we get a palindrome (835253352538).

The spelling of 515151201023 in words is "five hundred fifteen billion, one hundred fifty-one million, two hundred one thousand, twenty-three".