61619321 has 2 divisors, whose sum is σ = 61619322. Its totient is φ = 61619320.

The previous prime is 61619317. The next prime is 61619329. The reversal of 61619321 is 12391616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55294096 + 6325225 = 7436^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 61619321 - 2² = 61619317 is a prime.

It is a Chen prime.

It is equal to p_3652391 and since 61619321 and 3652391 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (61619329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30809660 + 30809661.

It is an arithmetic number, because the mean of its divisors is an integer number (30809661).

Almost surely, 2^61619321 is an apocalyptic number.

It is an amenable number.

61619321 is a deficient number, since it is larger than the sum of its proper divisors (1).

61619321 is an equidigital number, since it uses as much as digits as its factorization.

61619321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 61619321 is about 7849.7975133120. The cubic root of 61619321 is about 394.9774510442.

The spelling of 61619321 in words is "sixty-one million, six hundred nineteen thousand, three hundred twenty-one".