61621947 has 12 divisors (see below), whose sum is σ = 89294400. Its totient is φ = 40949808.

The previous prime is 61621927. The next prime is 61621969. The reversal of 61621947 is 74912616.

It is not a de Polignac number, because 61621947 - 2¹⁴ = 61605563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61621907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7947 + ... + 13652.

It is an arithmetic number, because the mean of its divisors is an integer number (7441200).

Almost surely, 2^61621947 is an apocalyptic number.

61621947 is a deficient number, since it is larger than the sum of its proper divisors (27672453).

61621947 is a wasteful number, since it uses less digits than its factorization.

61621947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21922 (or 21919 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 61621947 is about 7849.9647769910. The cubic root of 61621947 is about 394.9830618171.

The spelling of 61621947 in words is "sixty-one million, six hundred twenty-one thousand, nine hundred forty-seven".