1520381 has 2 divisors, whose sum is σ = 1520382. Its totient is φ = 1520380.

The previous prime is 1520359. The next prime is 1520401. The reversal of 1520381 is 1830251.

It is an a-pointer prime, because the next prime (1520401) can be obtained adding 1520381 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 872356 + 648025 = 934^2 + 805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1520381 is a prime.

It is a super-2 number, since 2×1520381² = 4623116770322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1520341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760190 + 760191.

It is an arithmetic number, because the mean of its divisors is an integer number (760191).

2^1520381 is an apocalyptic number.

It is an amenable number.

1520381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520381 is an equidigital number, since it uses as much as digits as its factorization.

1520381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1520381 is about 1233.0373068160. The cubic root of 1520381 is about 114.9875474859.

The spelling of 1520381 in words is "one million, five hundred twenty thousand, three hundred eighty-one".