61405137 has 6 divisors (see below), whose sum is σ = 88696322. Its totient is φ = 40936752.

The previous prime is 61405133. The next prime is 61405153. The reversal of 61405137 is 73150416.

61405137 is a `hidden beast` number, since 6 + 140 + 513 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 60466176 + 938961 = 7776^2 + 969^2 .

It is not a de Polignac number, because 61405137 - 2² = 61405133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61405137.

It is not an unprimeable number, because it can be changed into a prime (61405133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3411388 + ... + 3411405.

Almost surely, 2^61405137 is an apocalyptic number.

It is an amenable number.

61405137 is a deficient number, since it is larger than the sum of its proper divisors (27291185).

61405137 is a wasteful number, since it uses less digits than its factorization.

61405137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822799 (or 6822796 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 61405137 is about 7836.1429925698. The cubic root of 61405137 is about 394.5192827443.

The spelling of 61405137 in words is "sixty-one million, four hundred five thousand, one hundred thirty-seven".