61819349 has 4 divisors (see below), whose sum is σ = 63327180. Its totient is φ = 60311520.

The previous prime is 61819339. The next prime is 61819367. The reversal of 61819349 is 94391816.

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 12567025 + 49252324 = 3545^2 + 7018^2 .

It is a cyclic number.

It is not a de Polignac number, because 61819349 - 2¹² = 61815253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 1507789 = 61819349 / (6 + 1 + 8 + 1 + 9 + 3 + 4 + 9).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61819309) 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, 753854 + ... + 753935.

It is an arithmetic number, because the mean of its divisors is an integer number (15831795).

Almost surely, 2^61819349 is an apocalyptic number.

It is an amenable number.

61819349 is a deficient number, since it is larger than the sum of its proper divisors (1507831).

61819349 is a wasteful number, since it uses less digits than its factorization.

61819349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507830.

The product of its digits is 46656, while the sum is 41.

The square root of 61819349 is about 7862.5281557524. The cubic root of 61819349 is about 395.4043799795.

The spelling of 61819349 in words is "sixty-one million, eight hundred nineteen thousand, three hundred forty-nine".