61511939 has 2 divisors, whose sum is σ = 61511940. Its totient is φ = 61511938.

The previous prime is 61511927. The next prime is 61511941. The reversal of 61511939 is 93911516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61511939 - 2²⁰ = 60463363 is a prime.

Together with 61511941, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61511899 and 61511908.

It is not a weakly prime, because it can be changed into another prime (61511969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30755969 + 30755970.

It is an arithmetic number, because the mean of its divisors is an integer number (30755970).

Almost surely, 2^61511939 is an apocalyptic number.

61511939 is a deficient number, since it is larger than the sum of its proper divisors (1).

61511939 is an equidigital number, since it uses as much as digits as its factorization.

61511939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7290, while the sum is 35.

The square root of 61511939 is about 7842.9547365773. The cubic root of 61511939 is about 394.7478794890.

It can be divided in two parts, 61 and 511939, that added together give a cube (512000 = 80³).

The spelling of 61511939 in words is "sixty-one million, five hundred eleven thousand, nine hundred thirty-nine".