61402739 has 2 divisors, whose sum is σ = 61402740. Its totient is φ = 61402738.

The previous prime is 61402687. The next prime is 61402741. The reversal of 61402739 is 93720416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61402739 - 2¹² = 61398643 is a prime.

Together with 61402741, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61402769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30701369 + 30701370.

It is an arithmetic number, because the mean of its divisors is an integer number (30701370).

Almost surely, 2^61402739 is an apocalyptic number.

61402739 is a deficient number, since it is larger than the sum of its proper divisors (1).

61402739 is an equidigital number, since it uses as much as digits as its factorization.

61402739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 61402739 is about 7835.9899821273. The cubic root of 61402739 is about 394.5141470743.

The spelling of 61402739 in words is "sixty-one million, four hundred two thousand, seven hundred thirty-nine".