1520420251351 has 4 divisors (see below), whose sum is σ = 1520432098552. Its totient is φ = 1520408404152.

The previous prime is 1520420251297. The next prime is 1520420251403. The reversal of 1520420251351 is 1531520240251.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1520420251351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520420251951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5728965 + ... + 5988478.

It is an arithmetic number, because the mean of its divisors is an integer number (380108024638).

Almost surely, 2^{1520420251351} is an apocalyptic number.

1520420251351 is a deficient number, since it is larger than the sum of its proper divisors (11847201).

1520420251351 is a wasteful number, since it uses less digits than its factorization.

1520420251351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11847200.

The product of its (nonzero) digits is 12000, while the sum is 31.

It can be divided in two parts, 1520420 and 251351, that added together give a palindrome (1771771).

The spelling of 1520420251351 in words is "one trillion, five hundred twenty billion, four hundred twenty million, two hundred fifty-one thousand, three hundred fifty-one".