61611251 has 4 divisors (see below), whose sum is σ = 66350592. Its totient is φ = 56871912.

The previous prime is 61611241. The next prime is 61611287. The reversal of 61611251 is 15211616.

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

It is a cyclic number.

It is not a de Polignac number, because 61611251 - 2¹⁴ = 61594867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61611241) 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, 2369651 + ... + 2369676.

It is an arithmetic number, because the mean of its divisors is an integer number (16587648).

Almost surely, 2^61611251 is an apocalyptic number.

61611251 is a deficient number, since it is larger than the sum of its proper divisors (4739341).

61611251 is a wasteful number, since it uses less digits than its factorization.

61611251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4739340.

The product of its digits is 360, while the sum is 23.

The square root of 61611251 is about 7849.2834704831. The cubic root of 61611251 is about 394.9602074960.

Adding to 61611251 its reverse (15211616), we get a palindrome (76822867).

The spelling of 61611251 in words is "sixty-one million, six hundred eleven thousand, two hundred fifty-one".