61551013 has 16 divisors (see below), whose sum is σ = 68745600. Its totient is φ = 54838080.

The previous prime is 61551011. The next prime is 61551019. The reversal of 61551013 is 31015516.

It is a cyclic number.

It is not a de Polignac number, because 61551013 - 2¹ = 61551011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61551011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25503 + ... + 27811.

It is an arithmetic number, because the mean of its divisors is an integer number (4296600).

Almost surely, 2^61551013 is an apocalyptic number.

It is an amenable number.

61551013 is a deficient number, since it is larger than the sum of its proper divisors (7194587).

61551013 is a wasteful number, since it uses less digits than its factorization.

61551013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2412.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 61551013 is about 7845.4453665805. The cubic root of 61551013 is about 394.8314465387.

Adding to 61551013 its reverse (31015516), we get a palindrome (92566529).

The spelling of 61551013 in words is "sixty-one million, five hundred fifty-one thousand, thirteen".