61503907 has 4 divisors (see below), whose sum is σ = 63487936. Its totient is φ = 59519880.

The previous prime is 61503899. The next prime is 61503947. The reversal of 61503907 is 70930516.

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 61503907 - 2³ = 61503899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1983997 = 61503907 / (6 + 1 + 5 + 0 + 3 + 9 + 0 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61503947) 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, 991968 + ... + 992029.

It is an arithmetic number, because the mean of its divisors is an integer number (15871984).

Almost surely, 2^61503907 is an apocalyptic number.

61503907 is a deficient number, since it is larger than the sum of its proper divisors (1984029).

61503907 is a wasteful number, since it uses less digits than its factorization.

61503907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984028.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 61503907 is about 7842.4426679447. The cubic root of 61503907 is about 394.7306971716.

The spelling of 61503907 in words is "sixty-one million, five hundred three thousand, nine hundred seven".