195454981 has 4 divisors (see below), whose sum is σ = 195620832. Its totient is φ = 195289132.

The previous prime is 195454949. The next prime is 195454991. The reversal of 195454981 is 189454591.

It is a happy number.

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: 189454591 = 3727 ⋅50833.

It is a cyclic number.

It is not a de Polignac number, because 195454981 - 2⁵ = 195454949 is a prime.

It is a super-2 number, since 2×195454981² = 76405299195420722, 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 (195454991) 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, 81145 + ... + 83518.

It is an arithmetic number, because the mean of its divisors is an integer number (48905208).

Almost surely, 2^195454981 is an apocalyptic number.

It is an amenable number.

195454981 is a deficient number, since it is larger than the sum of its proper divisors (165851).

195454981 is a wasteful number, since it uses less digits than its factorization.

195454981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165850.

The product of its digits is 259200, while the sum is 46.

The square root of 195454981 is about 13980.5214852666. The cubic root of 195454981 is about 580.3396553947.

The spelling of 195454981 in words is "one hundred ninety-five million, four hundred fifty-four thousand, nine hundred eighty-one".