61630421 has 4 divisors (see below), whose sum is σ = 63133644. Its totient is φ = 60127200.

The previous prime is 61630411. The next prime is 61630441. The reversal of 61630421 is 12403616.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3276100 + 58354321 = 1810^2 + 7639^2 .

It is a cyclic number.

It is not a de Polignac number, because 61630421 - 2¹⁸ = 61368277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61630411) 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, 751550 + ... + 751631.

It is an arithmetic number, because the mean of its divisors is an integer number (15783411).

Almost surely, 2^61630421 is an apocalyptic number.

It is an amenable number.

61630421 is a deficient number, since it is larger than the sum of its proper divisors (1503223).

61630421 is a wasteful number, since it uses less digits than its factorization.

61630421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503222.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 61630421 is about 7850.5045060811. The cubic root of 61630421 is about 395.0011664763.

The spelling of 61630421 in words is "sixty-one million, six hundred thirty thousand, four hundred twenty-one".