61537121 has 4 divisors (see below), whose sum is σ = 64212672. Its totient is φ = 58861572.

The previous prime is 61537111. The next prime is 61537141. The reversal of 61537121 is 12173516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61537121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61537111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1337741 + ... + 1337786.

It is an arithmetic number, because the mean of its divisors is an integer number (16053168).

Almost surely, 2^61537121 is an apocalyptic number.

It is an amenable number.

61537121 is a deficient number, since it is larger than the sum of its proper divisors (2675551).

61537121 is a wasteful number, since it uses less digits than its factorization.

61537121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675550.

The product of its digits is 1260, while the sum is 26.

The square root of 61537121 is about 7844.5599621649. The cubic root of 61537121 is about 394.8017399539.

The spelling of 61537121 in words is "sixty-one million, five hundred thirty-seven thousand, one hundred twenty-one".