61091421 has 24 divisors (see below), whose sum is σ = 89359104. Its totient is φ = 37079040.

The previous prime is 61091419. The next prime is 61091467. The reversal of 61091421 is 12419016.

It is not a de Polignac number, because 61091421 - 2¹ = 61091419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61091391 and 61091400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61091621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25741 + ... + 28013.

It is an arithmetic number, because the mean of its divisors is an integer number (3723296).

Almost surely, 2^61091421 is an apocalyptic number.

It is an amenable number.

61091421 is a deficient number, since it is larger than the sum of its proper divisors (28267683).

61091421 is a wasteful number, since it uses less digits than its factorization.

61091421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341 (or 2324 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 61091421 is about 7816.1001145072. The cubic root of 61091421 is about 393.8462750723.

The spelling of 61091421 in words is "sixty-one million, ninety-one thousand, four hundred twenty-one".