61323557 has 4 divisors (see below), whose sum is σ = 61523616. Its totient is φ = 61123500.

The previous prime is 61323523. The next prime is 61323593. The reversal of 61323557 is 75532316.

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 61323557 - 2¹⁰ = 61322533 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 (61323517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99569 + ... + 100182.

It is an arithmetic number, because the mean of its divisors is an integer number (15380904).

Almost surely, 2^61323557 is an apocalyptic number.

It is an amenable number.

61323557 is a deficient number, since it is larger than the sum of its proper divisors (200059).

61323557 is a wasteful number, since it uses less digits than its factorization.

61323557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200058.

The product of its digits is 18900, while the sum is 32.

The square root of 61323557 is about 7830.9358955364. The cubic root of 61323557 is about 394.3444920112.

The spelling of 61323557 in words is "sixty-one million, three hundred twenty-three thousand, five hundred fifty-seven".