61916509 has 8 divisors (see below), whose sum is σ = 63173088. Its totient is φ = 60669840.

The previous prime is 61916507. The next prime is 61916521. The reversal of 61916509 is 90561916.

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

It is not a de Polignac number, because 61916509 - 2¹ = 61916507 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 (61916507) 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, 10854 + ... + 15544.

It is an arithmetic number, because the mean of its divisors is an integer number (7896636).

Almost surely, 2^61916509 is an apocalyptic number.

It is an amenable number.

61916509 is a deficient number, since it is larger than the sum of its proper divisors (1256579).

61916509 is a wasteful number, since it uses less digits than its factorization.

61916509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4955.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 61916509 is about 7868.7044041570. The cubic root of 61916509 is about 395.6114207692.

The spelling of 61916509 in words is "sixty-one million, nine hundred sixteen thousand, five hundred nine".