915461921 has 12 divisors (see below), whose sum is σ = 1017569700. Its totient is φ = 822877440.

The previous prime is 915461909. The next prime is 915461941. The reversal of 915461921 is 129164519.

It can be written as a sum of positive squares in 2 ways, for example, as 329821921 + 585640000 = 18161^2 + 24200^2 .

It is not a de Polignac number, because 915461921 - 2¹⁴ = 915445537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (915461941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31736 + ... + 53273.

It is an arithmetic number, because the mean of its divisors is an integer number (84797475).

Almost surely, 2^915461921 is an apocalyptic number.

It is an amenable number.

915461921 is a deficient number, since it is larger than the sum of its proper divisors (102107779).

915461921 is a wasteful number, since it uses less digits than its factorization.

915461921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85120 (or 85109 counting only the distinct ones).

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

The square root of 915461921 is about 30256.6012797208. The cubic root of 915461921 is about 970.9870283925.

The spelling of 915461921 in words is "nine hundred fifteen million, four hundred sixty-one thousand, nine hundred twenty-one".