61906949 has 4 divisors (see below), whose sum is σ = 66669036. Its totient is φ = 57144864.

The previous prime is 61906939. The next prime is 61906951. The reversal of 61906949 is 94960916.

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 26884225 + 35022724 = 5185^2 + 5918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61906949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61906939) 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, 2381024 + ... + 2381049.

It is an arithmetic number, because the mean of its divisors is an integer number (16667259).

Almost surely, 2^61906949 is an apocalyptic number.

It is an amenable number.

61906949 is a deficient number, since it is larger than the sum of its proper divisors (4762087).

61906949 is a wasteful number, since it uses less digits than its factorization.

61906949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4762086.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 61906949 is about 7868.0969109436. The cubic root of 61906949 is about 395.5910587262.

The spelling of 61906949 in words is "sixty-one million, nine hundred six thousand, nine hundred forty-nine".