195749261 has 4 divisors (see below), whose sum is σ = 196374972. Its totient is φ = 195123552.

The previous prime is 195749249. The next prime is 195749269. The reversal of 195749261 is 162947591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2706025 + 193043236 = 1645^2 + 13894^2 .

It is a cyclic number.

It is not a de Polignac number, because 195749261 - 2¹⁰ = 195748237 is a prime.

It is a super-2 number, since 2×195749261² = 76635546364092242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195749269) 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, 312386 + ... + 313011.

It is an arithmetic number, because the mean of its divisors is an integer number (49093743).

Almost surely, 2^195749261 is an apocalyptic number.

It is an amenable number.

195749261 is a deficient number, since it is larger than the sum of its proper divisors (625711).

195749261 is an equidigital number, since it uses as much as digits as its factorization.

195749261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625710.

The product of its digits is 136080, while the sum is 44.

The square root of 195749261 is about 13991.0421699029. The cubic root of 195749261 is about 580.6307654220.

The spelling of 195749261 in words is "one hundred ninety-five million, seven hundred forty-nine thousand, two hundred sixty-one".