61290217 has 4 divisors (see below), whose sum is σ = 61411140. Its totient is φ = 61169296.

The previous prime is 61290211. The next prime is 61290223. The reversal of 61290217 is 71209216.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (61290211) and next prime (61290223).

It can be written as a sum of positive squares in 2 ways, for example, as 58125376 + 3164841 = 7624^2 + 1779^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61290217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61290211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59698 + ... + 60715.

It is an arithmetic number, because the mean of its divisors is an integer number (15352785).

Almost surely, 2^61290217 is an apocalyptic number.

It is an amenable number.

61290217 is a deficient number, since it is larger than the sum of its proper divisors (120923).

61290217 is a wasteful number, since it uses less digits than its factorization.

61290217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120922.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 61290217 is about 7828.8068695044. The cubic root of 61290217 is about 394.2730141574.

The spelling of 61290217 in words is "sixty-one million, two hundred ninety thousand, two hundred seventeen".