61405429 has 4 divisors (see below), whose sum is σ = 62564076. Its totient is φ = 60246784.

The previous prime is 61405417. The next prime is 61405447. The reversal of 61405429 is 92450416.

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 53436100 + 7969329 = 7310^2 + 2823^2 .

It is a cyclic number.

It is not a de Polignac number, because 61405429 - 2⁷ = 61405301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61405429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61403429) 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, 579244 + ... + 579349.

It is an arithmetic number, because the mean of its divisors is an integer number (15641019).

Almost surely, 2^61405429 is an apocalyptic number.

It is an amenable number.

61405429 is a deficient number, since it is larger than the sum of its proper divisors (1158647).

61405429 is a wasteful number, since it uses less digits than its factorization.

61405429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158646.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 61405429 is about 7836.1616241627. The cubic root of 61405429 is about 394.5199080961.

The spelling of 61405429 in words is "sixty-one million, four hundred five thousand, four hundred twenty-nine".