61909397 has 4 divisors (see below), whose sum is σ = 67537536. Its totient is φ = 56281260.

The previous prime is 61909369. The next prime is 61909409. The reversal of 61909397 is 79390916.

It is a happy number.

61909397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61909397 - 2²² = 57715093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61909357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2814053 + ... + 2814074.

It is an arithmetic number, because the mean of its divisors is an integer number (16884384).

Almost surely, 2^61909397 is an apocalyptic number.

It is an amenable number.

61909397 is a deficient number, since it is larger than the sum of its proper divisors (5628139).

61909397 is a wasteful number, since it uses less digits than its factorization.

61909397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5628138.

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 61909397 is about 7868.2524743427. The cubic root of 61909397 is about 395.5962729720.

The spelling of 61909397 in words is "sixty-one million, nine hundred nine thousand, three hundred ninety-seven".