61319421 has 6 divisors (see below), whose sum is σ = 88572510. Its totient is φ = 40879608.

The previous prime is 61319413. The next prime is 61319431. The reversal of 61319421 is 12491316.

61319421 is a `hidden beast` number, since 613 + 1 + 9 + 42 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 60140025 + 1179396 = 7755^2 + 1086^2 .

It is not a de Polignac number, because 61319421 - 2³ = 61319413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61319431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3406626 + ... + 3406643.

It is an arithmetic number, because the mean of its divisors is an integer number (14762085).

Almost surely, 2^61319421 is an apocalyptic number.

It is an amenable number.

61319421 is a deficient number, since it is larger than the sum of its proper divisors (27253089).

61319421 is a wasteful number, since it uses less digits than its factorization.

61319421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6813275 (or 6813272 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 61319421 is about 7830.6718102600. The cubic root of 61319421 is about 394.3356262204.

The spelling of 61319421 in words is "sixty-one million, three hundred nineteen thousand, four hundred twenty-one".