61928821 has 2 divisors, whose sum is σ = 61928822. Its totient is φ = 61928820.

The previous prime is 61928767. The next prime is 61928831. The reversal of 61928821 is 12882916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45077796 + 16851025 = 6714^2 + 4105^2 .

It is a cyclic number.

It is not a de Polignac number, because 61928821 - 2⁷ = 61928693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61928831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30964410 + 30964411.

It is an arithmetic number, because the mean of its divisors is an integer number (30964411).

Almost surely, 2^61928821 is an apocalyptic number.

It is an amenable number.

61928821 is a deficient number, since it is larger than the sum of its proper divisors (1).

61928821 is an equidigital number, since it uses as much as digits as its factorization.

61928821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 37.

The square root of 61928821 is about 7869.4867049891. The cubic root of 61928821 is about 395.6376412666.

The spelling of 61928821 in words is "sixty-one million, nine hundred twenty-eight thousand, eight hundred twenty-one".