61400819 has 2 divisors, whose sum is σ = 61400820. Its totient is φ = 61400818.

The previous prime is 61400813. The next prime is 61400839. The reversal of 61400819 is 91800416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61400819 - 2⁴ = 61400803 is a prime.

It is a super-2 number, since 2×61400819² = 7540121147741522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 61400791 and 61400800.

It is not a weakly prime, because it can be changed into another prime (61400813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30700409 + 30700410.

It is an arithmetic number, because the mean of its divisors is an integer number (30700410).

Almost surely, 2^61400819 is an apocalyptic number.

61400819 is a deficient number, since it is larger than the sum of its proper divisors (1).

61400819 is an equidigital number, since it uses as much as digits as its factorization.

61400819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 61400819 is about 7835.8674695275. The cubic root of 61400819 is about 394.5100350153.

The spelling of 61400819 in words is "sixty-one million, four hundred thousand, eight hundred nineteen".