61651273 has 2 divisors, whose sum is σ = 61651274. Its totient is φ = 61651272.

The previous prime is 61651259. The next prime is 61651301. The reversal of 61651273 is 37215616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55756089 + 5895184 = 7467^2 + 2428^2 .

It is a cyclic number.

It is not a de Polignac number, because 61651273 - 2²⁵ = 28096841 is a prime.

It is not a weakly prime, because it can be changed into another prime (61651573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30825636 + 30825637.

It is an arithmetic number, because the mean of its divisors is an integer number (30825637).

Almost surely, 2^61651273 is an apocalyptic number.

It is an amenable number.

61651273 is a deficient number, since it is larger than the sum of its proper divisors (1).

61651273 is an equidigital number, since it uses as much as digits as its factorization.

61651273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 61651273 is about 7851.8324612793. The cubic root of 61651273 is about 395.0457096064.

Adding to 61651273 its reverse (37215616), we get a palindrome (98866889).

The spelling of 61651273 in words is "sixty-one million, six hundred fifty-one thousand, two hundred seventy-three".