101625649 has 2 divisors, whose sum is σ = 101625650. Its totient is φ = 101625648.

The previous prime is 101625647. The next prime is 101625683. The reversal of 101625649 is 946526101.

It is an a-pointer prime, because the next prime (101625683) can be obtained adding 101625649 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61074225 + 40551424 = 7815^2 + 6368^2 .

It is a cyclic number.

It is not a de Polignac number, because 101625649 - 2¹ = 101625647 is a prime.

Together with 101625647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (101625647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50812824 + 50812825.

It is an arithmetic number, because the mean of its divisors is an integer number (50812825).

Almost surely, 2^101625649 is an apocalyptic number.

It is an amenable number.

101625649 is a deficient number, since it is larger than the sum of its proper divisors (1).

101625649 is an equidigital number, since it uses as much as digits as its factorization.

101625649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 101625649 is about 10080.9547662907. The cubic root of 101625649 is about 466.6605737867.

The spelling of 101625649 in words is "one hundred one million, six hundred twenty-five thousand, six hundred forty-nine".