61649499 has 16 divisors (see below), whose sum is σ = 86745600. Its totient is φ = 38867136.

The previous prime is 61649479. The next prime is 61649501. The reversal of 61649499 is 99494616.

It is a de Polignac number, because none of the positive numbers 2^k-61649499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61649479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1122 + ... + 11160.

It is an arithmetic number, because the mean of its divisors is an integer number (5421600).

Almost surely, 2^61649499 is an apocalyptic number.

61649499 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

61649499 is a deficient number, since it is larger than the sum of its proper divisors (25096101).

61649499 is a wasteful number, since it uses less digits than its factorization.

61649499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10154.

The product of its digits is 419904, while the sum is 48.

The square root of 61649499 is about 7851.7194932066. The cubic root of 61649499 is about 395.0419204561.

The spelling of 61649499 in words is "sixty-one million, six hundred forty-nine thousand, four hundred ninety-nine".