101620249 has 2 divisors, whose sum is σ = 101620250. Its totient is φ = 101620248.

The previous prime is 101620229. The next prime is 101620319. The reversal of 101620249 is 942026101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98644624 + 2975625 = 9932^2 + 1725^2 .

It is an emirp because it is prime and its reverse (942026101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101620249 - 2⁹ = 101619737 is a prime.

It is not a weakly prime, because it can be changed into another prime (101620219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50810124 + 50810125.

It is an arithmetic number, because the mean of its divisors is an integer number (50810125).

Almost surely, 2^101620249 is an apocalyptic number.

It is an amenable number.

101620249 is a deficient number, since it is larger than the sum of its proper divisors (1).

101620249 is an equidigital number, since it uses as much as digits as its factorization.

101620249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 101620249 is about 10080.6869309586. The cubic root of 101620249 is about 466.6523081183.

The spelling of 101620249 in words is "one hundred one million, six hundred twenty thousand, two hundred forty-nine".