61278533 has 4 divisors (see below), whose sum is σ = 61296288. Its totient is φ = 61260780.

The previous prime is 61278517. The next prime is 61278541. The reversal of 61278533 is 33587216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61278533 - 2⁴ = 61278517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61278493 and 61278502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61278563) 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, 1841 + ... + 11222.

It is an arithmetic number, because the mean of its divisors is an integer number (15324072).

Almost surely, 2^61278533 is an apocalyptic number.

It is an amenable number.

61278533 is a deficient number, since it is larger than the sum of its proper divisors (17755).

61278533 is a wasteful number, since it uses less digits than its factorization.

61278533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17754.

The product of its digits is 30240, while the sum is 35.

The square root of 61278533 is about 7828.0606155037. The cubic root of 61278533 is about 394.2479586163.

The spelling of 61278533 in words is "sixty-one million, two hundred seventy-eight thousand, five hundred thirty-three".