61603961 has 4 divisors (see below), whose sum is σ = 62613924. Its totient is φ = 60594000.

The previous prime is 61603957. The next prime is 61603987. The reversal of 61603961 is 16930616.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1308736 + 60295225 = 1144^2 + 7765^2 .

It is a cyclic number.

It is not a de Polignac number, because 61603961 - 2² = 61603957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61683961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504890 + ... + 505011.

It is an arithmetic number, because the mean of its divisors is an integer number (15653481).

Almost surely, 2^61603961 is an apocalyptic number.

61603961 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

61603961 is a deficient number, since it is larger than the sum of its proper divisors (1009963).

61603961 is a wasteful number, since it uses less digits than its factorization.

61603961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009962.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 61603961 is about 7848.8190831488. The cubic root of 61603961 is about 394.9446293159.

The spelling of 61603961 in words is "sixty-one million, six hundred three thousand, nine hundred sixty-one".