101521669 has 2 divisors, whose sum is σ = 101521670. Its totient is φ = 101521668.

The previous prime is 101521649. The next prime is 101521681. The reversal of 101521669 is 966125101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95296644 + 6225025 = 9762^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 101521669 - 2⁹ = 101521157 is a prime.

It is a super-2 number, since 2×101521669² = 20613298553091122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 101521669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101521649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50760834 + 50760835.

It is an arithmetic number, because the mean of its divisors is an integer number (50760835).

Almost surely, 2^101521669 is an apocalyptic number.

It is an amenable number.

101521669 is a deficient number, since it is larger than the sum of its proper divisors (1).

101521669 is an equidigital number, since it uses as much as digits as its factorization.

101521669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 101521669 is about 10075.7961968273. The cubic root of 101521669 is about 466.5013622572.

The spelling of 101521669 in words is "one hundred one million, five hundred twenty-one thousand, six hundred sixty-nine".