61690919 has 8 divisors (see below), whose sum is σ = 62208000. Its totient is φ = 61176472.

The previous prime is 61690879. The next prime is 61690927. The reversal of 61690919 is 91909616.

61690919 = T₁ + T₂ + ... + T₇₁₇.

61690919 is a nontrivial binomial coefficient, being equal to C(719, 3).

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

It is not a de Polignac number, because 61690919 - 2²⁰ = 60642343 is a prime.

It is a super-2 number, since 2×61690919² = 7611538974129122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61690999) by changing a digit.

It is the 717-th tetrahedral number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85442 + ... + 86160.

It is an arithmetic number, because the mean of its divisors is an integer number (7776000).

Almost surely, 2^61690919 is an apocalyptic number.

61690919 is a deficient number, since it is larger than the sum of its proper divisors (517081).

61690919 is a wasteful number, since it uses less digits than its factorization.

61690919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 61690919 is about 7854.3566891248. The cubic root of 61690919 is about 395.1303719629.

The spelling of 61690919 in words is "sixty-one million, six hundred ninety thousand, nine hundred nineteen".