1520377013 has 4 divisors (see below), whose sum is σ = 1528777068. Its totient is φ = 1511976960.

The previous prime is 1520377007. The next prime is 1520377021. The reversal of 1520377013 is 3107730251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3107730251 = 28219 ⋅110129.

It can be written as a sum of positive squares in 2 ways, for example, as 53333809 + 1467043204 = 7303^2 + 38302^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520377013 - 2¹⁴ = 1520360629 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 (1520377513) 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, 4199756 + ... + 4200117.

It is an arithmetic number, because the mean of its divisors is an integer number (382194267).

Almost surely, 2^1520377013 is an apocalyptic number.

It is an amenable number.

1520377013 is a deficient number, since it is larger than the sum of its proper divisors (8400055).

1520377013 is an equidigital number, since it uses as much as digits as its factorization.

1520377013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8400054.

The product of its (nonzero) digits is 4410, while the sum is 29.

The square root of 1520377013 is about 38992.0121691610. The cubic root of 1520377013 is about 1149.8744697259.

The spelling of 1520377013 in words is "one billion, five hundred twenty million, three hundred seventy-seven thousand, thirteen".