61454545 has 4 divisors (see below), whose sum is σ = 73745460. Its totient is φ = 49163632.

The previous prime is 61454543. The next prime is 61454557. The reversal of 61454545 is 54545416.

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 21613201 + 39841344 = 4649^2 + 6312^2 .

It is a cyclic number.

It is not a de Polignac number, because 61454545 - 2¹ = 61454543 is a prime.

It is a super-2 number, since 2×61454545² = 7553322202314050, which contains 22 as substring.

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 61454545.

It is not an unprimeable number, because it can be changed into a prime (61454543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6145450 + ... + 6145459.

It is an arithmetic number, because the mean of its divisors is an integer number (18436365).

Almost surely, 2^61454545 is an apocalyptic number.

It is an amenable number.

61454545 is a deficient number, since it is larger than the sum of its proper divisors (12290915).

61454545 is a wasteful number, since it uses less digits than its factorization.

61454545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12290914.

The product of its digits is 48000, while the sum is 34.

The square root of 61454545 is about 7839.2949300304. The cubic root of 61454545 is about 394.6250675043.

The spelling of 61454545 in words is "sixty-one million, four hundred fifty-four thousand, five hundred forty-five".