61377557 has 4 divisors (see below), whose sum is σ = 61406016. Its totient is φ = 61349100.

The previous prime is 61377553. The next prime is 61377571. The reversal of 61377557 is 75577316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61377557 - 2² = 61377553 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 (61377553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10703 + ... + 15404.

It is an arithmetic number, because the mean of its divisors is an integer number (15351504).

Almost surely, 2^61377557 is an apocalyptic number.

It is an amenable number.

61377557 is a deficient number, since it is larger than the sum of its proper divisors (28459).

61377557 is a wasteful number, since it uses less digits than its factorization.

61377557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28458.

The product of its digits is 154350, while the sum is 41.

The square root of 61377557 is about 7834.3830005942. The cubic root of 61377557 is about 394.4602080382.

The spelling of 61377557 in words is "sixty-one million, three hundred seventy-seven thousand, five hundred fifty-seven".