1601702021 has 2 divisors, whose sum is σ = 1601702022. Its totient is φ = 1601702020.

The previous prime is 1601701963. The next prime is 1601702027. The reversal of 1601702021 is 1202071061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1569268996 + 32433025 = 39614^2 + 5695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601702021 - 2²⁶ = 1534593157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1601701984 and 1601702002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601702027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800851010 + 800851011.

It is an arithmetic number, because the mean of its divisors is an integer number (800851011).

Almost surely, 2^1601702021 is an apocalyptic number.

It is an amenable number.

1601702021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601702021 is an equidigital number, since it uses as much as digits as its factorization.

1601702021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 1601702021 is about 40021.2696075474. The cubic root of 1601702021 is about 1170.0216766140.

Adding to 1601702021 its reverse (1202071061), we get a palindrome (2803773082).

The spelling of 1601702021 in words is "one billion, six hundred one million, seven hundred two thousand, twenty-one".