61309607 has 4 divisors (see below), whose sum is σ = 61507056. Its totient is φ = 61112160.

The previous prime is 61309597. The next prime is 61309621. The reversal of 61309607 is 70690316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61309607 - 2⁶ = 61309543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61309687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98258 + ... + 98879.

It is an arithmetic number, because the mean of its divisors is an integer number (15376764).

Almost surely, 2^61309607 is an apocalyptic number.

61309607 is a deficient number, since it is larger than the sum of its proper divisors (197449).

61309607 is a wasteful number, since it uses less digits than its factorization.

61309607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197448.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 61309607 is about 7830.0451467409. The cubic root of 61309607 is about 394.3145876639.

It can be divided in two parts, 61309 and 607, that added together give a palindrome (61916).

The spelling of 61309607 in words is "sixty-one million, three hundred nine thousand, six hundred seven".