61436545 has 4 divisors (see below), whose sum is σ = 73723860. Its totient is φ = 49149232.

The previous prime is 61436509. The next prime is 61436561. The reversal of 61436545 is 54563416.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24275329 + 37161216 = 4927^2 + 6096^2 .

It is a cyclic number.

It is not a de Polignac number, because 61436545 - 2¹¹ = 61434497 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 61436545.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6143650 + ... + 6143659.

It is an arithmetic number, because the mean of its divisors is an integer number (18430965).

Almost surely, 2^61436545 is an apocalyptic number.

It is an amenable number.

61436545 is a deficient number, since it is larger than the sum of its proper divisors (12287315).

61436545 is a wasteful number, since it uses less digits than its factorization.

61436545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12287314.

The product of its digits is 43200, while the sum is 34.

The square root of 61436545 is about 7838.1467835197. The cubic root of 61436545 is about 394.5865352588.

The spelling of 61436545 in words is "sixty-one million, four hundred thirty-six thousand, five hundred forty-five".