61157761 has 8 divisors (see below), whose sum is σ = 72149504. Its totient is φ = 50729760.

The previous prime is 61157753. The next prime is 61157779. The reversal of 61157761 is 16775116.

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 61157761 - 2³ = 61157753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61157711) 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 7 ways as a sum of consecutive naturals, for example, 140700 + ... + 141133.

It is an arithmetic number, because the mean of its divisors is an integer number (9018688).

Almost surely, 2^61157761 is an apocalyptic number.

It is an amenable number.

61157761 is a deficient number, since it is larger than the sum of its proper divisors (10991743).

61157761 is a wasteful number, since it uses less digits than its factorization.

61157761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281871.

The product of its digits is 8820, while the sum is 34.

The square root of 61157761 is about 7820.3427674239. The cubic root of 61157761 is about 393.9887844987.

The spelling of 61157761 in words is "sixty-one million, one hundred fifty-seven thousand, seven hundred sixty-one".