61406749 has 2 divisors, whose sum is σ = 61406750. Its totient is φ = 61406748.

The previous prime is 61406729. The next prime is 61406759. The reversal of 61406749 is 94760416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32569849 + 28836900 = 5707^2 + 5370^2 .

It is a cyclic number.

It is not a de Polignac number, because 61406749 - 2¹⁵ = 61373981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61406729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30703374 + 30703375.

It is an arithmetic number, because the mean of its divisors is an integer number (30703375).

Almost surely, 2^61406749 is an apocalyptic number.

It is an amenable number.

61406749 is a deficient number, since it is larger than the sum of its proper divisors (1).

61406749 is an equidigital number, since it uses as much as digits as its factorization.

61406749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 61406749 is about 7836.2458486191. The cubic root of 61406749 is about 394.5227350044.

The spelling of 61406749 in words is "sixty-one million, four hundred six thousand, seven hundred forty-nine".