61381471 has 4 divisors (see below), whose sum is σ = 61534944. Its totient is φ = 61228000.

The previous prime is 61381451. The next prime is 61381501. The reversal of 61381471 is 17418316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61381471 - 2⁹ = 61380959 is a prime.

It is a super-3 number, since 3×61381471³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61381421) 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, 76135 + ... + 76936.

It is an arithmetic number, because the mean of its divisors is an integer number (15383736).

Almost surely, 2^61381471 is an apocalyptic number.

61381471 is a deficient number, since it is larger than the sum of its proper divisors (153473).

61381471 is a wasteful number, since it uses less digits than its factorization.

61381471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153472.

The product of its digits is 4032, while the sum is 31.

The square root of 61381471 is about 7834.6327929265. The cubic root of 61381471 is about 394.4685926688.

Adding to 61381471 its reverse (17418316), we get a palindrome (78799787).

The spelling of 61381471 in words is "sixty-one million, three hundred eighty-one thousand, four hundred seventy-one".