61758551 has 2 divisors, whose sum is σ = 61758552. Its totient is φ = 61758550.

The previous prime is 61758503. The next prime is 61758553. The reversal of 61758551 is 15585716.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61758551 - 2¹⁴ = 61742167 is a prime.

It is a Sophie Germain prime.

Together with 61758553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61758553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30879275 + 30879276.

It is an arithmetic number, because the mean of its divisors is an integer number (30879276).

Almost surely, 2^61758551 is an apocalyptic number.

61758551 is the 3515-th centered decagonal number.

61758551 is a deficient number, since it is larger than the sum of its proper divisors (1).

61758551 is an equidigital number, since it uses as much as digits as its factorization.

61758551 is an evil number, because the sum of its binary digits is even.

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

The square root of 61758551 is about 7858.6608910170. The cubic root of 61758551 is about 395.2747135614.

The spelling of 61758551 in words is "sixty-one million, seven hundred fifty-eight thousand, five hundred fifty-one".