61551530 has 16 divisors (see below), whose sum is σ = 110927880. Its totient is φ = 24590592.

The previous prime is 61551517. The next prime is 61551559. The reversal of 61551530 is 3515516.

It can be written as a sum of positive squares in 4 ways, for example, as 46936201 + 14615329 = 6851^2 + 3823^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61551530.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6086 + ... + 12654.

Almost surely, 2^61551530 is an apocalyptic number.

61551530 is a deficient number, since it is larger than the sum of its proper divisors (49376350).

61551530 is a wasteful number, since it uses less digits than its factorization.

61551530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7513.

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

The square root of 61551530 is about 7845.4783155650. The cubic root of 61551530 is about 394.8325520027.

The spelling of 61551530 in words is "sixty-one million, five hundred fifty-one thousand, five hundred thirty".