61921291 has 8 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 59583720.

The previous prime is 61921289. The next prime is 61921297. The reversal of 61921291 is 19212916.

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

It is a cyclic number.

It is not a de Polignac number, because 61921291 - 2¹ = 61921289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (61921297) 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, 31 + ... + 11128.

It is an arithmetic number, because the mean of its divisors is an integer number (8035200).

Almost surely, 2^61921291 is an apocalyptic number.

61921291 is a deficient number, since it is larger than the sum of its proper divisors (2360309).

61921291 is a wasteful number, since it uses less digits than its factorization.

61921291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11369.

The product of its digits is 1944, while the sum is 31.

The square root of 61921291 is about 7869.0082602575. The cubic root of 61921291 is about 395.6216052641.

The spelling of 61921291 in words is "sixty-one million, nine hundred twenty-one thousand, two hundred ninety-one".