61037721 has 12 divisors (see below), whose sum is σ = 91206180. Its totient is φ = 39288480.

The previous prime is 61037693. The next prime is 61037749. The reversal of 61037721 is 12773016.

It is an interprime number because it is at equal distance from previous prime (61037693) and next prime (61037749).

It can be written as a sum of positive squares in 2 ways, for example, as 47817225 + 13220496 = 6915^2 + 3636^2 .

It is not a de Polignac number, because 61037721 - 2⁵ = 61037689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61037321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116670 + ... + 117191.

It is an arithmetic number, because the mean of its divisors is an integer number (7600515).

Almost surely, 2^61037721 is an apocalyptic number.

It is an amenable number.

61037721 is a deficient number, since it is larger than the sum of its proper divisors (30168459).

61037721 is a wasteful number, since it uses less digits than its factorization.

61037721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233896 (or 233893 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 61037721 is about 7812.6641422757. The cubic root of 61037721 is about 393.7308429077.

It can be divided in two parts, 6103 and 7721, that added together give a cube (13824 = 24³).

The spelling of 61037721 in words is "sixty-one million, thirty-seven thousand, seven hundred twenty-one".