61554511 has 4 divisors (see below), whose sum is σ = 62003952. Its totient is φ = 61105072.

The previous prime is 61554497. The next prime is 61554529. The reversal of 61554511 is 11545516.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61554511 - 2¹³ = 61546319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61554511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61554011) 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, 224515 + ... + 224788.

It is an arithmetic number, because the mean of its divisors is an integer number (15500988).

Almost surely, 2^61554511 is an apocalyptic number.

61554511 is a deficient number, since it is larger than the sum of its proper divisors (449441).

61554511 is a wasteful number, since it uses less digits than its factorization.

61554511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449440.

The product of its digits is 3000, while the sum is 28.

The square root of 61554511 is about 7845.6682953079. The cubic root of 61554511 is about 394.8389259403.

The spelling of 61554511 in words is "sixty-one million, five hundred fifty-four thousand, five hundred eleven".