61520545 has 8 divisors (see below), whose sum is σ = 75217896. Its totient is φ = 48287616.

The previous prime is 61520533. The next prime is 61520549. The reversal of 61520545 is 54502516.

It can be written as a sum of positive squares in 4 ways, for example, as 24760576 + 36759969 = 4976^2 + 6063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61520545 - 2²³ = 53131937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61520549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115812 + ... + 116341.

It is an arithmetic number, because the mean of its divisors is an integer number (9402237).

Almost surely, 2^61520545 is an apocalyptic number.

It is an amenable number.

61520545 is a deficient number, since it is larger than the sum of its proper divisors (13697351).

61520545 is a wasteful number, since it uses less digits than its factorization.

61520545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232211.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 61520545 is about 7843.5033626563. The cubic root of 61520545 is about 394.7662880661.

The spelling of 61520545 in words is "sixty-one million, five hundred twenty thousand, five hundred forty-five".