101521649 has 2 divisors, whose sum is σ = 101521650. Its totient is φ = 101521648.

The previous prime is 101521643. The next prime is 101521669. The reversal of 101521649 is 946125101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77088400 + 24433249 = 8780^2 + 4943^2 .

It is a cyclic number.

It is not a de Polignac number, because 101521649 - 2⁸ = 101521393 is a prime.

It is not a weakly prime, because it can be changed into another prime (101521643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50760824 + 50760825.

It is an arithmetic number, because the mean of its divisors is an integer number (50760825).

Almost surely, 2^101521649 is an apocalyptic number.

It is an amenable number.

101521649 is a deficient number, since it is larger than the sum of its proper divisors (1).

101521649 is an equidigital number, since it uses as much as digits as its factorization.

101521649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 101521649 is about 10075.7952043499. The cubic root of 101521649 is about 466.5013316232.

The spelling of 101521649 in words is "one hundred one million, five hundred twenty-one thousand, six hundred forty-nine".