61355551 has 8 divisors (see below), whose sum is σ = 62491520. Its totient is φ = 60227712.

The previous prime is 61355537. The next prime is 61355597. The reversal of 61355551 is 15555316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61355551 - 2⁷ = 61355423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61355521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14395 + ... + 18163.

It is an arithmetic number, because the mean of its divisors is an integer number (7811440).

Almost surely, 2^61355551 is an apocalyptic number.

61355551 is a deficient number, since it is larger than the sum of its proper divisors (1135969).

61355551 is a wasteful number, since it uses less digits than its factorization.

61355551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4065.

The product of its digits is 11250, while the sum is 31.

The square root of 61355551 is about 7832.9784245841. The cubic root of 61355551 is about 394.4130598112.

The spelling of 61355551 in words is "sixty-one million, three hundred fifty-five thousand, five hundred fifty-one".