61988819 has 2 divisors, whose sum is σ = 61988820. Its totient is φ = 61988818.

The previous prime is 61988813. The next prime is 61988821. The reversal of 61988819 is 91888916.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61988819 - 2⁴ = 61988803 is a prime.

It is a super-2 number, since 2×61988819² = 7685227362029522, which contains 22 as substring.

Together with 61988821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61988813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30994409 + 30994410.

It is an arithmetic number, because the mean of its divisors is an integer number (30994410).

Almost surely, 2^61988819 is an apocalyptic number.

61988819 is a deficient number, since it is larger than the sum of its proper divisors (1).

61988819 is an equidigital number, since it uses as much as digits as its factorization.

61988819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 50.

The square root of 61988819 is about 7873.2978477891. The cubic root of 61988819 is about 395.7653675022.

The spelling of 61988819 in words is "sixty-one million, nine hundred eighty-eight thousand, eight hundred nineteen".