61330251 has 4 divisors (see below), whose sum is σ = 81773672. Its totient is φ = 40886832.

The previous prime is 61330231. The next prime is 61330261. The reversal of 61330251 is 15203316.

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

It is not a de Polignac number, because 61330251 - 2¹⁰ = 61329227 is a prime.

It is a super-2 number, since 2×61330251² = 7522799375446002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61330231) 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, 10221706 + ... + 10221711.

It is an arithmetic number, because the mean of its divisors is an integer number (20443418).

Almost surely, 2^61330251 is an apocalyptic number.

61330251 is a deficient number, since it is larger than the sum of its proper divisors (20443421).

61330251 is a wasteful number, since it uses less digits than its factorization.

61330251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20443420.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 61330251 is about 7831.3632912795. The cubic root of 61330251 is about 394.3588402004.

Adding to 61330251 its reverse (15203316), we get a palindrome (76533567).

The spelling of 61330251 in words is "sixty-one million, three hundred thirty thousand, two hundred fifty-one".