61451865 has 20 divisors (see below), whose sum is σ = 110158884. Its totient is φ = 32774112.

The previous prime is 61451861. The next prime is 61451869. The reversal of 61451865 is 56815416.

It is an interprime number because it is at equal distance from previous prime (61451861) and next prime (61451869).

It can be written as a sum of positive squares in 2 ways, for example, as 34857216 + 26594649 = 5904^2 + 5157^2 .

It is not a de Polignac number, because 61451865 - 2² = 61451861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61451861) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 75462 + ... + 76271.

Almost surely, 2^61451865 is an apocalyptic number.

It is an amenable number.

61451865 is a deficient number, since it is larger than the sum of its proper divisors (48707019).

61451865 is a wasteful number, since it uses less digits than its factorization.

61451865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151750 (or 151741 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 61451865 is about 7839.1239944269. The cubic root of 61451865 is about 394.6193309578.

The spelling of 61451865 in words is "sixty-one million, four hundred fifty-one thousand, eight hundred sixty-five".