61517251 has 4 divisors (see below), whose sum is σ = 61549600. Its totient is φ = 61484904.

The previous prime is 61517233. The next prime is 61517263. The reversal of 61517251 is 15271516.

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 61517251 - 2⁹ = 61516739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61512251) 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, 13131 + ... + 17188.

It is an arithmetic number, because the mean of its divisors is an integer number (15387400).

Almost surely, 2^61517251 is an apocalyptic number.

61517251 is a deficient number, since it is larger than the sum of its proper divisors (32349).

61517251 is a wasteful number, since it uses less digits than its factorization.

61517251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32348.

The product of its digits is 2100, while the sum is 28.

The square root of 61517251 is about 7843.2933771471. The cubic root of 61517251 is about 394.7592422716.

Adding to 61517251 its reverse (15271516), we get a palindrome (76788767).

The spelling of 61517251 in words is "sixty-one million, five hundred seventeen thousand, two hundred fifty-one".