61631092321 has 2 divisors, whose sum is σ = 61631092322. Its totient is φ = 61631092320.

The previous prime is 61631092309. The next prime is 61631092373. The reversal of 61631092321 is 12329013616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61274071296 + 357021025 = 247536^2 + 18895^2 .

It is a cyclic number.

It is not a de Polignac number, because 61631092321 - 2²³ = 61622703713 is a prime.

It is not a weakly prime, because it can be changed into another prime (61631092021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30815546160 + 30815546161.

It is an arithmetic number, because the mean of its divisors is an integer number (30815546161).

Almost surely, 2^61631092321 is an apocalyptic number.

It is an amenable number.

61631092321 is a deficient number, since it is larger than the sum of its proper divisors (1).

61631092321 is an equidigital number, since it uses as much as digits as its factorization.

61631092321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 61631092321 in words is "sixty-one billion, six hundred thirty-one million, ninety-two thousand, three hundred twenty-one".