61321553 has 8 divisors (see below), whose sum is σ = 62034240. Its totient is φ = 60613200.

The previous prime is 61321541. The next prime is 61321613. The reversal of 61321553 is 35512316.

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 61321553 - 2⁶ = 61321489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61321523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33383 + ... + 35171.

It is an arithmetic number, because the mean of its divisors is an integer number (7754280).

Almost surely, 2^61321553 is an apocalyptic number.

It is an amenable number.

61321553 is a deficient number, since it is larger than the sum of its proper divisors (712687).

61321553 is a wasteful number, since it uses less digits than its factorization.

61321553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167.

The product of its digits is 2700, while the sum is 26.

The square root of 61321553 is about 7830.8079404363. The cubic root of 61321553 is about 394.3401963539.

Adding to 61321553 its reverse (35512316), we get a palindrome (96833869).

The spelling of 61321553 in words is "sixty-one million, three hundred twenty-one thousand, five hundred fifty-three".