61621973 has 8 divisors (see below), whose sum is σ = 70572480. Its totient is φ = 52708320.

The previous prime is 61621969. The next prime is 61621979. The reversal of 61621973 is 37912616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61621973 - 2² = 61621969 is a prime.

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 (61621979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5528 + ... + 12401.

It is an arithmetic number, because the mean of its divisors is an integer number (8821560).

Almost surely, 2^61621973 is an apocalyptic number.

It is an amenable number.

61621973 is a deficient number, since it is larger than the sum of its proper divisors (8950507).

61621973 is a wasteful number, since it uses less digits than its factorization.

61621973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18427.

The product of its digits is 13608, while the sum is 35.

The square root of 61621973 is about 7849.9664330493. The cubic root of 61621973 is about 394.9831173685.

The spelling of 61621973 in words is "sixty-one million, six hundred twenty-one thousand, nine hundred seventy-three".