201453781 has 8 divisors (see below), whose sum is σ = 206121728. Its totient is φ = 196830000.

The previous prime is 201453761. The next prime is 201453809. The reversal of 201453781 is 187354102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 9-Lehmer number, since φ(201453781) divides (201453781-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 201453781 - 2⁷ = 201453653 is a prime.

It is a super-2 number, since 2×201453781² = 81167251758391922, 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 (201453701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1725 + ... + 20146.

It is an arithmetic number, because the mean of its divisors is an integer number (25765216).

Almost surely, 2^201453781 is an apocalyptic number.

201453781 is the 6348-th centered decagonal number.

It is an amenable number.

201453781 is a deficient number, since it is larger than the sum of its proper divisors (4667947).

201453781 is a wasteful number, since it uses less digits than its factorization.

201453781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22083.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 201453781 is about 14193.4414783730. The cubic root of 201453781 is about 586.2170886670.

The spelling of 201453781 in words is "two hundred one million, four hundred fifty-three thousand, seven hundred eighty-one".