101545921 has 2 divisors, whose sum is σ = 101545922. Its totient is φ = 101545920.

The previous prime is 101545909. The next prime is 101545957. The reversal of 101545921 is 129545101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50979600 + 50566321 = 7140^2 + 7111^2 .

It is a cyclic number.

It is not a de Polignac number, because 101545921 - 2⁷ = 101545793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101545921.

It is not a weakly prime, because it can be changed into another prime (101545901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50772960 + 50772961.

It is an arithmetic number, because the mean of its divisors is an integer number (50772961).

Almost surely, 2^101545921 is an apocalyptic number.

It is an amenable number.

101545921 is a deficient number, since it is larger than the sum of its proper divisors (1).

101545921 is an equidigital number, since it uses as much as digits as its factorization.

101545921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 101545921 is about 10076.9996030565. Note that the first 3 decimals coincide. The cubic root of 101545921 is about 466.5385060196.

The spelling of 101545921 in words is "one hundred one million, five hundred forty-five thousand, nine hundred twenty-one".