61530913 has 4 divisors (see below), whose sum is σ = 61568388. Its totient is φ = 61493440.

The previous prime is 61530907. The next prime is 61530919. The reversal of 61530913 is 31903516.

61530913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (61530907) and next prime (61530919).

It can be written as a sum of positive squares in 2 ways, for example, as 51437584 + 10093329 = 7172^2 + 3177^2 .

It is a cyclic number.

It is not a de Polignac number, because 61530913 - 2⁵ = 61530881 is a prime.

It is a super-2 number, since 2×61530913² = 7572106509227138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61530919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16156 + ... + 19597.

It is an arithmetic number, because the mean of its divisors is an integer number (15392097).

Almost surely, 2^61530913 is an apocalyptic number.

It is an amenable number.

61530913 is a deficient number, since it is larger than the sum of its proper divisors (37475).

61530913 is a wasteful number, since it uses less digits than its factorization.

61530913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37474.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 61530913 is about 7844.1642639608. The cubic root of 61530913 is about 394.7884633518.

The spelling of 61530913 in words is "sixty-one million, five hundred thirty thousand, nine hundred thirteen".