201522551 has 2 divisors, whose sum is σ = 201522552. Its totient is φ = 201522550.

The previous prime is 201522523. The next prime is 201522557. The reversal of 201522551 is 155225102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201522551 - 2²⁶ = 134413687 is a prime.

It is a super-2 number, since 2×201522551² = 81222677123095202, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201522557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100761275 + 100761276.

It is an arithmetic number, because the mean of its divisors is an integer number (100761276).

Almost surely, 2^201522551 is an apocalyptic number.

201522551 is a deficient number, since it is larger than the sum of its proper divisors (1).

201522551 is an equidigital number, since it uses as much as digits as its factorization.

201522551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 201522551 is about 14195.8638694516. The cubic root of 201522551 is about 586.2837864517.

Adding to 201522551 its reverse (155225102), we get a palindrome (356747653).

The spelling of 201522551 in words is "two hundred one million, five hundred twenty-two thousand, five hundred fifty-one".