61813321 has 2 divisors, whose sum is σ = 61813322. Its totient is φ = 61813320.

The previous prime is 61813303. The next prime is 61813333. The reversal of 61813321 is 12331816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53860921 + 7952400 = 7339^2 + 2820^2 .

It is a cyclic number.

It is not a de Polignac number, because 61813321 - 2¹¹ = 61811273 is a prime.

It is not a weakly prime, because it can be changed into another prime (61813361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30906660 + 30906661.

It is an arithmetic number, because the mean of its divisors is an integer number (30906661).

Almost surely, 2^61813321 is an apocalyptic number.

It is an amenable number.

61813321 is a deficient number, since it is larger than the sum of its proper divisors (1).

61813321 is an equidigital number, since it uses as much as digits as its factorization.

61813321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 61813321 is about 7862.1448091472. The cubic root of 61813321 is about 395.3915276115.

The spelling of 61813321 in words is "sixty-one million, eight hundred thirteen thousand, three hundred twenty-one".