61153557 has 4 divisors (see below), whose sum is σ = 81538080. Its totient is φ = 40769036.

The previous prime is 61153531. The next prime is 61153579. The reversal of 61153557 is 75535116.

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 61153557 - 2¹¹ = 61151509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61157557) 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, 10192257 + ... + 10192262.

It is an arithmetic number, because the mean of its divisors is an integer number (20384520).

Almost surely, 2^61153557 is an apocalyptic number.

It is an amenable number.

61153557 is a deficient number, since it is larger than the sum of its proper divisors (20384523).

61153557 is a wasteful number, since it uses less digits than its factorization.

61153557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20384522.

The product of its digits is 15750, while the sum is 33.

The square root of 61153557 is about 7820.0739766322. The cubic root of 61153557 is about 393.9797566622.

The spelling of 61153557 in words is "sixty-one million, one hundred fifty-three thousand, five hundred fifty-seven".