61223409 has 24 divisors (see below), whose sum is σ = 100841832. Its totient is φ = 35458560.

The previous prime is 61223389. The next prime is 61223411. The reversal of 61223409 is 90432216.

61223409 = 1522² + 1523² + ... + 1547².

61223409 is a `hidden beast` number, since 612 + 2 + 3 + 40 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2241009 + 58982400 = 1497^2 + 7680^2 .

It is not a de Polignac number, because 61223409 - 2¹¹ = 61221361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61223479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13402 + ... + 17379.

It is an arithmetic number, because the mean of its divisors is an integer number (4201743).

Almost surely, 2^61223409 is an apocalyptic number.

It is an amenable number.

61223409 is a deficient number, since it is larger than the sum of its proper divisors (39618423).

61223409 is a wasteful number, since it uses less digits than its factorization.

61223409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30817 (or 30814 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 61223409 is about 7824.5389001525. The cubic root of 61223409 is about 394.1297059794.

The spelling of 61223409 in words is "sixty-one million, two hundred twenty-three thousand, four hundred nine".