61572839 has 2 divisors, whose sum is σ = 61572840. Its totient is φ = 61572838.

The previous prime is 61572779. The next prime is 61572877. The reversal of 61572839 is 93827516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61572839 - 2¹² = 61568743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61572796 and 61572805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61572899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30786419 + 30786420.

It is an arithmetic number, because the mean of its divisors is an integer number (30786420).

Almost surely, 2^61572839 is an apocalyptic number.

61572839 is a deficient number, since it is larger than the sum of its proper divisors (1).

61572839 is an equidigital number, since it uses as much as digits as its factorization.

61572839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 61572839 is about 7846.8362414415. The cubic root of 61572839 is about 394.8781101236.

The spelling of 61572839 in words is "sixty-one million, five hundred seventy-two thousand, eight hundred thirty-nine".