1520115671 has 4 divisors (see below), whose sum is σ = 1527992112. Its totient is φ = 1512239232.

The previous prime is 1520115647. The next prime is 1520115677. The reversal of 1520115671 is 1765110251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1765110251 = 53 ⋅33303967.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1520115671 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 (1520115677) 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, 3937931 + ... + 3938316.

It is an arithmetic number, because the mean of its divisors is an integer number (381998028).

Almost surely, 2^1520115671 is an apocalyptic number.

1520115671 is a deficient number, since it is larger than the sum of its proper divisors (7876441).

1520115671 is an equidigital number, since it uses as much as digits as its factorization.

1520115671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7876440.

The product of its (nonzero) digits is 2100, while the sum is 29.

The square root of 1520115671 is about 38988.6608002891. The cubic root of 1520115671 is about 1149.8085808682.

The spelling of 1520115671 in words is "one billion, five hundred twenty million, one hundred fifteen thousand, six hundred seventy-one".