61619143 has 2 divisors, whose sum is σ = 61619144. Its totient is φ = 61619142.

The previous prime is 61619123. The next prime is 61619149. The reversal of 61619143 is 34191616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61619143 - 2⁵ = 61619111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61619149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30809571 + 30809572.

It is an arithmetic number, because the mean of its divisors is an integer number (30809572).

Almost surely, 2^61619143 is an apocalyptic number.

61619143 is a deficient number, since it is larger than the sum of its proper divisors (1).

61619143 is an equidigital number, since it uses as much as digits as its factorization.

61619143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 61619143 is about 7849.7861754318. The cubic root of 61619143 is about 394.9770707194.

The spelling of 61619143 in words is "sixty-one million, six hundred nineteen thousand, one hundred forty-three".