61726421 has 4 divisors (see below), whose sum is σ = 64975200. Its totient is φ = 58477644.

The previous prime is 61726409. The next prime is 61726429. The reversal of 61726421 is 12462716.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61726421 - 2¹⁰ = 61725397 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 (61726429) 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, 1624361 + ... + 1624398.

It is an arithmetic number, because the mean of its divisors is an integer number (16243800).

Almost surely, 2^61726421 is an apocalyptic number.

It is an amenable number.

61726421 is a deficient number, since it is larger than the sum of its proper divisors (3248779).

61726421 is a wasteful number, since it uses less digits than its factorization.

61726421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3248778.

The product of its digits is 4032, while the sum is 29.

The square root of 61726421 is about 7856.6163836603. The cubic root of 61726421 is about 395.2061542045.

The spelling of 61726421 in words is "sixty-one million, seven hundred twenty-six thousand, four hundred twenty-one".