7261550921 has 4 divisors (see below), whose sum is σ = 7457809092. Its totient is φ = 7065292752.

The previous prime is 7261550893. The next prime is 7261550939. The reversal of 7261550921 is 1290551627.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1290551627 = 503 ⋅2565709.

It can be written as a sum of positive squares in 2 ways, for example, as 5337763600 + 1923787321 = 73060^2 + 43861^2 .

It is a cyclic number.

It is not a de Polignac number, because 7261550921 - 2¹⁴ = 7261534537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7261550971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98129030 + ... + 98129103.

It is an arithmetic number, because the mean of its divisors is an integer number (1864452273).

Almost surely, 2^7261550921 is an apocalyptic number.

It is an amenable number.

7261550921 is a deficient number, since it is larger than the sum of its proper divisors (196258171).

7261550921 is a wasteful number, since it uses less digits than its factorization.

7261550921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196258170.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 7261550921 is about 85214.7341778404. The cubic root of 7261550921 is about 1936.4656413636.

The spelling of 7261550921 in words is "seven billion, two hundred sixty-one million, five hundred fifty thousand, nine hundred twenty-one".