61587551 has 2 divisors, whose sum is σ = 61587552. Its totient is φ = 61587550.

The previous prime is 61587541. The next prime is 61587587. The reversal of 61587551 is 15578516.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61587551 - 2²² = 57393247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61587541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30793775 + 30793776.

It is an arithmetic number, because the mean of its divisors is an integer number (30793776).

Almost surely, 2^61587551 is an apocalyptic number.

61587551 is a deficient number, since it is larger than the sum of its proper divisors (1).

61587551 is an equidigital number, since it uses as much as digits as its factorization.

61587551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42000, while the sum is 38.

The square root of 61587551 is about 7847.7736333307. The cubic root of 61587551 is about 394.9095578865.

The spelling of 61587551 in words is "sixty-one million, five hundred eighty-seven thousand, five hundred fifty-one".