195142621 has 2 divisors, whose sum is σ = 195142622. Its totient is φ = 195142620.

The previous prime is 195142601. The next prime is 195142681. The reversal of 195142621 is 126241591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139476100 + 55666521 = 11810^2 + 7461^2 .

It is a cyclic number.

It is not a de Polignac number, because 195142621 - 2⁹ = 195142109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195142601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97571310 + 97571311.

It is an arithmetic number, because the mean of its divisors is an integer number (97571311).

Almost surely, 2^195142621 is an apocalyptic number.

It is an amenable number.

195142621 is a deficient number, since it is larger than the sum of its proper divisors (1).

195142621 is an equidigital number, since it uses as much as digits as its factorization.

195142621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 31.

The square root of 195142621 is about 13969.3457613447. The cubic root of 195142621 is about 580.0303402678.

The spelling of 195142621 in words is "one hundred ninety-five million, one hundred forty-two thousand, six hundred twenty-one".