61528553 has 4 divisors (see below), whose sum is σ = 61551828. Its totient is φ = 61505280.

The previous prime is 61528501. The next prime is 61528591. The reversal of 61528553 is 35582516.

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 49674304 + 11854249 = 7048^2 + 3443^2 .

It is a cyclic number.

It is not a de Polignac number, because 61528553 - 2¹⁴ = 61512169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61522553) 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, 7076 + ... + 13157.

It is an arithmetic number, because the mean of its divisors is an integer number (15387957).

Almost surely, 2^61528553 is an apocalyptic number.

It is an amenable number.

61528553 is a deficient number, since it is larger than the sum of its proper divisors (23275).

61528553 is a wasteful number, since it uses less digits than its factorization.

61528553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23274.

The product of its digits is 36000, while the sum is 35.

The square root of 61528553 is about 7844.0138322163. The cubic root of 61528553 is about 394.7834159556.

The spelling of 61528553 in words is "sixty-one million, five hundred twenty-eight thousand, five hundred fifty-three".