61871399 has 2 divisors, whose sum is σ = 61871400. Its totient is φ = 61871398.

The previous prime is 61871393. The next prime is 61871417. The reversal of 61871399 is 99317816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61871399 - 2²⁰ = 60822823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61871393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30935699 + 30935700.

It is an arithmetic number, because the mean of its divisors is an integer number (30935700).

Almost surely, 2^61871399 is an apocalyptic number.

61871399 is a deficient number, since it is larger than the sum of its proper divisors (1).

61871399 is an equidigital number, since it uses as much as digits as its factorization.

61871399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 61871399 is about 7865.8374633601. The cubic root of 61871399 is about 395.5153216447.

The spelling of 61871399 in words is "sixty-one million, eight hundred seventy-one thousand, three hundred ninety-nine".