61223545 has 16 divisors (see below), whose sum is σ = 78673680. Its totient is φ = 45574144.

The previous prime is 61223531. The next prime is 61223551. The reversal of 61223545 is 54532216.

It can be written as a sum of positive squares in 8 ways, for example, as 881721 + 60341824 = 939^2 + 7768^2 .

It is not a de Polignac number, because 61223545 - 2⁷ = 61223417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3519 + ... + 11611.

It is an arithmetic number, because the mean of its divisors is an integer number (4917105).

Almost surely, 2^61223545 is an apocalyptic number.

It is an amenable number.

61223545 is a deficient number, since it is larger than the sum of its proper divisors (17450135).

61223545 is a wasteful number, since it uses less digits than its factorization.

61223545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8204.

The product of its digits is 7200, while the sum is 28.

The square root of 61223545 is about 7824.5475907556. The cubic root of 61223545 is about 394.1299978155.

The spelling of 61223545 in words is "sixty-one million, two hundred twenty-three thousand, five hundred forty-five".