61212557 has 8 divisors (see below), whose sum is σ = 70055232. Its totient is φ = 52394400.

The previous prime is 61212539. The next prime is 61212581. The reversal of 61212557 is 75521216.

61212557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61212557 - 2⁶ = 61212493 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 (61212587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419 + ... + 11072.

It is an arithmetic number, because the mean of its divisors is an integer number (8756904).

Almost surely, 2^61212557 is an apocalyptic number.

It is an amenable number.

61212557 is a deficient number, since it is larger than the sum of its proper divisors (8842675).

61212557 is a wasteful number, since it uses less digits than its factorization.

61212557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12259.

The product of its digits is 4200, while the sum is 29.

The square root of 61212557 is about 7823.8454100270. The cubic root of 61212557 is about 394.1064177831.

The spelling of 61212557 in words is "sixty-one million, two hundred twelve thousand, five hundred fifty-seven".