61970391 has 24 divisors (see below), whose sum is σ = 102835200. Its totient is φ = 35226576.

The previous prime is 61970387. The next prime is 61970401. The reversal of 61970391 is 19307916.

61970391 is a `hidden beast` number, since 619 + 7 + 0 + 39 + 1 = 666.

It is not a de Polignac number, because 61970391 - 2² = 61970387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61970351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10066 + ... + 15008.

It is an arithmetic number, because the mean of its divisors is an integer number (4284800).

Almost surely, 2^61970391 is an apocalyptic number.

61970391 is a deficient number, since it is larger than the sum of its proper divisors (40864809).

61970391 is a wasteful number, since it uses less digits than its factorization.

61970391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5155 (or 5152 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 61970391 is about 7872.1274761020. The cubic root of 61970391 is about 395.7261459827.

The spelling of 61970391 in words is "sixty-one million, nine hundred seventy thousand, three hundred ninety-one".