1516421 has 2 divisors, whose sum is σ = 1516422. Its totient is φ = 1516420.

The previous prime is 1516397. The next prime is 1516433. The reversal of 1516421 is 1246151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 923521 + 592900 = 961^2 + 770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1516421 - 2⁶ = 1516357 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1516393 and 1516402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1516441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758210 + 758211.

It is an arithmetic number, because the mean of its divisors is an integer number (758211).

2^1516421 is an apocalyptic number.

It is an amenable number.

1516421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516421 is an equidigital number, since it uses as much as digits as its factorization.

1516421 is an evil number, because the sum of its binary digits is even.

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

The square root of 1516421 is about 1231.4304690075. The cubic root of 1516421 is about 114.8876281021.

The spelling of 1516421 in words is "one million, five hundred sixteen thousand, four hundred twenty-one".