61477481 has 4 divisors (see below), whose sum is σ = 66206532. Its totient is φ = 56748432.

The previous prime is 61477441. The next prime is 61477489. The reversal of 61477481 is 18477416.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9709456 + 51768025 = 3116^2 + 7195^2 .

It is not a de Polignac number, because 61477481 - 2¹⁴ = 61461097 is a prime.

It is a super-2 number, since 2×61477481² = 7558961340210722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (61477489) 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, 2364506 + ... + 2364531.

It is an arithmetic number, because the mean of its divisors is an integer number (16551633).

Almost surely, 2^61477481 is an apocalyptic number.

It is an amenable number.

61477481 is a deficient number, since it is larger than the sum of its proper divisors (4729051).

61477481 is a wasteful number, since it uses less digits than its factorization.

61477481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4729050.

The product of its digits is 37632, while the sum is 38.

The square root of 61477481 is about 7840.7576802245. The cubic root of 61477481 is about 394.6741552475.

The spelling of 61477481 in words is "sixty-one million, four hundred seventy-seven thousand, four hundred eighty-one".