61390873 has 2 divisors, whose sum is σ = 61390874. Its totient is φ = 61390872.

The previous prime is 61390829. The next prime is 61390891. The reversal of 61390873 is 37809316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52881984 + 8508889 = 7272^2 + 2917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61390873 is a prime.

It is not a weakly prime, because it can be changed into another prime (61390573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30695436 + 30695437.

It is an arithmetic number, because the mean of its divisors is an integer number (30695437).

Almost surely, 2^61390873 is an apocalyptic number.

It is an amenable number.

61390873 is a deficient number, since it is larger than the sum of its proper divisors (1).

61390873 is an equidigital number, since it uses as much as digits as its factorization.

61390873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 61390873 is about 7835.2327980731. The cubic root of 61390873 is about 394.4887323207.

The spelling of 61390873 in words is "sixty-one million, three hundred ninety thousand, eight hundred seventy-three".