61561634 has 16 divisors (see below), whose sum is σ = 99273600. Its totient is φ = 28539504.

The previous prime is 61561631. The next prime is 61561649. The reversal of 61561634 is 43616516.

It is a self number, because there is not a number n which added to its sum of digits gives 61561634.

It is not an unprimeable number, because it can be changed into a prime (61561631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15449 + ... + 19020.

It is an arithmetic number, because the mean of its divisors is an integer number (6204600).

Almost surely, 2^61561634 is an apocalyptic number.

61561634 is a deficient number, since it is larger than the sum of its proper divisors (37711966).

61561634 is a wasteful number, since it uses less digits than its factorization.

61561634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34537.

The product of its digits is 12960, while the sum is 32.

The square root of 61561634 is about 7846.1222269348. The cubic root of 61561634 is about 394.8541554182.

The spelling of 61561634 in words is "sixty-one million, five hundred sixty-one thousand, six hundred thirty-four".