61913545 has 4 divisors (see below), whose sum is σ = 74296260. Its totient is φ = 49530832.

The previous prime is 61913531. The next prime is 61913557. The reversal of 61913545 is 54531916.

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 41229241 + 20684304 = 6421^2 + 4548^2 .

It is a cyclic number.

It is not a de Polignac number, because 61913545 - 2⁵ = 61913513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61913545.

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, 6191350 + ... + 6191359.

It is an arithmetic number, because the mean of its divisors is an integer number (18574065).

Almost surely, 2^61913545 is an apocalyptic number.

It is an amenable number.

61913545 is a deficient number, since it is larger than the sum of its proper divisors (12382715).

61913545 is a wasteful number, since it uses less digits than its factorization.

61913545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12382714.

The product of its digits is 16200, while the sum is 34.

The square root of 61913545 is about 7868.5160608593. The cubic root of 61913545 is about 395.6051079081.

The spelling of 61913545 in words is "sixty-one million, nine hundred thirteen thousand, five hundred forty-five".