61443919 has 2 divisors, whose sum is σ = 61443920. Its totient is φ = 61443918.

The previous prime is 61443913. The next prime is 61443923. The reversal of 61443919 is 91934416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61443919 - 2³ = 61443911 is a prime.

It is a super-2 number, since 2×61443919² = 7550710364157122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61443911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30721959 + 30721960.

It is an arithmetic number, because the mean of its divisors is an integer number (30721960).

Almost surely, 2^61443919 is an apocalyptic number.

61443919 is a deficient number, since it is larger than the sum of its proper divisors (1).

61443919 is an equidigital number, since it uses as much as digits as its factorization.

61443919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 61443919 is about 7838.6171612090. The cubic root of 61443919 is about 394.6023215453.

The spelling of 61443919 in words is "sixty-one million, four hundred forty-three thousand, nine hundred nineteen".