201195981 has 56 divisors (see below), whose sum is σ = 349410240. Its totient is φ = 113420736.

The previous prime is 201195961. The next prime is 201195989. The reversal of 201195981 is 189591102.

It is not a de Polignac number, because 201195981 - 2⁷ = 201195853 is a prime.

It is a super-2 number, since 2×201195981² = 80959645541104722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201195989) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 453946 + ... + 454388.

Almost surely, 2^201195981 is an apocalyptic number.

201195981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201195981 is a deficient number, since it is larger than the sum of its proper divisors (148214259).

201195981 is an frugal number, since it uses more digits than its factorization.

201195981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 201195981 is about 14184.3569117532. The cubic root of 201195981 is about 585.9669216458.

The spelling of 201195981 in words is "two hundred one million, one hundred ninety-five thousand, nine hundred eighty-one".