2171542801 has 2 divisors, whose sum is σ = 2171542802. Its totient is φ = 2171542800.

The previous prime is 2171542771. The next prime is 2171542811. The reversal of 2171542801 is 1082451712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2153052801 + 18490000 = 46401^2 + 4300^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171542801 - 2⁷ = 2171542673 is a prime.

It is not a weakly prime, because it can be changed into another prime (2171542811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085771400 + 1085771401.

It is an arithmetic number, because the mean of its divisors is an integer number (1085771401).

Almost surely, 2^2171542801 is an apocalyptic number.

It is an amenable number.

2171542801 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171542801 is an equidigital number, since it uses as much as digits as its factorization.

2171542801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 2171542801 is about 46599.8154610080. The cubic root of 2171542801 is about 1294.9593366380.

It can be divided in two parts, 21715 and 42801, that added together give a square (64516 = 254²).

The spelling of 2171542801 in words is "two billion, one hundred seventy-one million, five hundred forty-two thousand, eight hundred one".