101561143 has 2 divisors, whose sum is σ = 101561144. Its totient is φ = 101561142.

The previous prime is 101561101. The next prime is 101561147. The reversal of 101561143 is 341165101.

It is a strong prime.

It is an emirp because it is prime and its reverse (341165101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101561143 - 2¹⁷ = 101430071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101561147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50780571 + 50780572.

It is an arithmetic number, because the mean of its divisors is an integer number (50780572).

Almost surely, 2^101561143 is an apocalyptic number.

101561143 is a deficient number, since it is larger than the sum of its proper divisors (1).

101561143 is an equidigital number, since it uses as much as digits as its factorization.

101561143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 101561143 is about 10077.7548590944. The cubic root of 101561143 is about 466.5618166369.

The spelling of 101561143 in words is "one hundred one million, five hundred sixty-one thousand, one hundred forty-three".