61143477 has 4 divisors (see below), whose sum is σ = 81524640. Its totient is φ = 40762316.

The previous prime is 61143469. The next prime is 61143479. The reversal of 61143477 is 77434116.

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 61143477 - 2³ = 61143469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61143479) 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, 10190577 + ... + 10190582.

It is an arithmetic number, because the mean of its divisors is an integer number (20381160).

Almost surely, 2^61143477 is an apocalyptic number.

It is an amenable number.

61143477 is a deficient number, since it is larger than the sum of its proper divisors (20381163).

61143477 is a wasteful number, since it uses less digits than its factorization.

61143477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20381162.

The product of its digits is 14112, while the sum is 33.

The square root of 61143477 is about 7819.4294548899. The cubic root of 61143477 is about 393.9581087845.

It can be divided in two parts, 6114 and 3477, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 61143477 in words is "sixty-one million, one hundred forty-three thousand, four hundred seventy-seven".