1516339421 has 2 divisors, whose sum is σ = 1516339422. Its totient is φ = 1516339420.

The previous prime is 1516339417. The next prime is 1516339453. The reversal of 1516339421 is 1249336151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1399807396 + 116532025 = 37414^2 + 10795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1516339421 - 2² = 1516339417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1516339411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758169710 + 758169711.

It is an arithmetic number, because the mean of its divisors is an integer number (758169711).

Almost surely, 2^1516339421 is an apocalyptic number.

It is an amenable number.

1516339421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516339421 is an equidigital number, since it uses as much as digits as its factorization.

1516339421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 1516339421 is about 38940.2031453355. The cubic root of 1516339421 is about 1148.8556785940.

The spelling of 1516339421 in words is "one billion, five hundred sixteen million, three hundred thirty-nine thousand, four hundred twenty-one".