61821967 has 16 divisors (see below), whose sum is σ = 65839104. Its totient is φ = 57960000.

The previous prime is 61821941. The next prime is 61821983. The reversal of 61821967 is 76912816.

It is a cyclic number.

It is not a de Polignac number, because 61821967 - 2¹⁹ = 61297679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61821667) 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, 219867 + ... + 220147.

It is an arithmetic number, because the mean of its divisors is an integer number (4114944).

Almost surely, 2^61821967 is an apocalyptic number.

61821967 is a deficient number, since it is larger than the sum of its proper divisors (4017137).

61821967 is a wasteful number, since it uses less digits than its factorization.

61821967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510.

The product of its digits is 36288, while the sum is 40.

The square root of 61821967 is about 7862.6946398801. The cubic root of 61821967 is about 395.4099615872.

The spelling of 61821967 in words is "sixty-one million, eight hundred twenty-one thousand, nine hundred sixty-seven".