61512065 has 16 divisors (see below), whose sum is σ = 76014288. Its totient is φ = 47763456.

The previous prime is 61511993. The next prime is 61512067. The reversal of 61512065 is 56021516.

It can be written as a sum of positive squares in 8 ways, for example, as 5456896 + 56055169 = 2336^2 + 7487^2 .

It is a cyclic number.

It is not a de Polignac number, because 61512065 - 2²⁰ = 60463489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61512067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24509 + ... + 26901.

It is an arithmetic number, because the mean of its divisors is an integer number (4750893).

Almost surely, 2^61512065 is an apocalyptic number.

It is an amenable number.

61512065 is a deficient number, since it is larger than the sum of its proper divisors (14502223).

61512065 is a wasteful number, since it uses less digits than its factorization.

61512065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 61512065 is about 7842.9627692601. The cubic root of 61512065 is about 394.7481490204.

The spelling of 61512065 in words is "sixty-one million, five hundred twelve thousand, sixty-five".