1421751161 has 2 divisors, whose sum is σ = 1421751162. Its totient is φ = 1421751160.

The previous prime is 1421751119. The next prime is 1421751173. The reversal of 1421751161 is 1611571241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1193287936 + 228463225 = 34544^2 + 15115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421751161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1421754161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710875580 + 710875581.

It is an arithmetic number, because the mean of its divisors is an integer number (710875581).

Almost surely, 2^1421751161 is an apocalyptic number.

It is an amenable number.

1421751161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421751161 is an equidigital number, since it uses as much as digits as its factorization.

1421751161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 29.

The square root of 1421751161 is about 37706.1156975894. The cubic root of 1421751161 is about 1124.4527144768.

The spelling of 1421751161 in words is "one billion, four hundred twenty-one million, seven hundred fifty-one thousand, one hundred sixty-one".