201553091 has 2 divisors, whose sum is σ = 201553092. Its totient is φ = 201553090.

The previous prime is 201553087. The next prime is 201553123. The reversal of 201553091 is 190355102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201553091 - 2² = 201553087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201553091.

It is not a weakly prime, because it can be changed into another prime (201553031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100776545 + 100776546.

It is an arithmetic number, because the mean of its divisors is an integer number (100776546).

Almost surely, 2^201553091 is an apocalyptic number.

201553091 is a deficient number, since it is larger than the sum of its proper divisors (1).

201553091 is an equidigital number, since it uses as much as digits as its factorization.

201553091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 201553091 is about 14196.9394941304. The cubic root of 201553091 is about 586.3134013382.

The spelling of 201553091 in words is "two hundred one million, five hundred fifty-three thousand, ninety-one".