61421251 has 8 divisors (see below), whose sum is σ = 62593344. Its totient is φ = 60258240.

The previous prime is 61421237. The next prime is 61421267. The reversal of 61421251 is 15212416.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61421251 - 2⁵ = 61421219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61421291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12246 + ... + 16516.

It is an arithmetic number, because the mean of its divisors is an integer number (7824168).

Almost surely, 2^61421251 is an apocalyptic number.

61421251 is a deficient number, since it is larger than the sum of its proper divisors (1172093).

61421251 is a wasteful number, since it uses less digits than its factorization.

61421251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4541.

The product of its digits is 480, while the sum is 22.

The square root of 61421251 is about 7837.1711095267. The cubic root of 61421251 is about 394.5537897797.

Adding to 61421251 its reverse (15212416), we get a palindrome (76633667).

The spelling of 61421251 in words is "sixty-one million, four hundred twenty-one thousand, two hundred fifty-one".