921615941 has 2 divisors, whose sum is σ = 921615942. Its totient is φ = 921615940.

The previous prime is 921615923. The next prime is 921615973. The reversal of 921615941 is 149516129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 849722500 + 71893441 = 29150^2 + 8479^2 .

It is a cyclic number.

It is not a de Polignac number, because 921615941 - 2¹⁰ = 921614917 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 921615895 and 921615904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921615641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460807970 + 460807971.

It is an arithmetic number, because the mean of its divisors is an integer number (460807971).

Almost surely, 2^921615941 is an apocalyptic number.

It is an amenable number.

921615941 is a deficient number, since it is larger than the sum of its proper divisors (1).

921615941 is an equidigital number, since it uses as much as digits as its factorization.

921615941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 38.

The square root of 921615941 is about 30358.1280878779. The cubic root of 921615941 is about 973.1579301611.

The spelling of 921615941 in words is "nine hundred twenty-one million, six hundred fifteen thousand, nine hundred forty-one".