195406261 has 4 divisors (see below), whose sum is σ = 196185024. Its totient is φ = 194627500.

The previous prime is 195406249. The next prime is 195406301. The reversal of 195406261 is 162604591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 162604591 = 1201 ⋅135391.

It is a cyclic number.

It is not a de Polignac number, because 195406261 - 2¹³ = 195398069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195406201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389005 + ... + 389506.

It is an arithmetic number, because the mean of its divisors is an integer number (49046256).

Almost surely, 2^195406261 is an apocalyptic number.

195406261 is the 6252-nd centered decagonal number.

It is an amenable number.

195406261 is a deficient number, since it is larger than the sum of its proper divisors (778763).

195406261 is an equidigital number, since it uses as much as digits as its factorization.

195406261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778762.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 195406261 is about 13978.7789523978. The cubic root of 195406261 is about 580.2914320179.

The spelling of 195406261 in words is "one hundred ninety-five million, four hundred six thousand, two hundred sixty-one".