61455421 has 4 divisors (see below), whose sum is σ = 61472700. Its totient is φ = 61438144.

The previous prime is 61455413. The next prime is 61455439. The reversal of 61455421 is 12455416.

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 46049796 + 15405625 = 6786^2 + 3925^2 .

It is a cyclic number.

It is not a de Polignac number, because 61455421 - 2³ = 61455413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61455421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61455451) 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, 1126 + ... + 11143.

It is an arithmetic number, because the mean of its divisors is an integer number (15368175).

Almost surely, 2^61455421 is an apocalyptic number.

It is an amenable number.

61455421 is a deficient number, since it is larger than the sum of its proper divisors (17279).

61455421 is a wasteful number, since it uses less digits than its factorization.

61455421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17278.

The product of its digits is 4800, while the sum is 28.

The square root of 61455421 is about 7839.3508022029. The cubic root of 61455421 is about 394.6269425482.

The spelling of 61455421 in words is "sixty-one million, four hundred fifty-five thousand, four hundred twenty-one".