61550513 has 4 divisors (see below), whose sum is σ = 61728240. Its totient is φ = 61372788.

The previous prime is 61550479. The next prime is 61550527. The reversal of 61550513 is 31505516.

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 61550513 - 2¹⁰ = 61549489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61550563) 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, 88343 + ... + 89036.

It is an arithmetic number, because the mean of its divisors is an integer number (15432060).

Almost surely, 2^61550513 is an apocalyptic number.

It is an amenable number.

61550513 is a deficient number, since it is larger than the sum of its proper divisors (177727).

61550513 is a wasteful number, since it uses less digits than its factorization.

61550513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177726.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 61550513 is about 7845.4135008934. The cubic root of 61550513 is about 394.8303774187.

The spelling of 61550513 in words is "sixty-one million, five hundred fifty thousand, five hundred thirteen".