61087591 has 2 divisors, whose sum is σ = 61087592. Its totient is φ = 61087590.

The previous prime is 61087573. The next prime is 61087643. The reversal of 61087591 is 19578016.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61087591 - 2⁷ = 61087463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61087591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61087561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30543795 + 30543796.

It is an arithmetic number, because the mean of its divisors is an integer number (30543796).

Almost surely, 2^61087591 is an apocalyptic number.

61087591 is a deficient number, since it is larger than the sum of its proper divisors (1).

61087591 is an equidigital number, since it uses as much as digits as its factorization.

61087591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 61087591 is about 7815.8551035699. The cubic root of 61087591 is about 393.8380444417.

The spelling of 61087591 in words is "sixty-one million, eighty-seven thousand, five hundred ninety-one".