61634919 has 8 divisors (see below), whose sum is σ = 83730672. Its totient is φ = 40314560.

The previous prime is 61634897. The next prime is 61634927. The reversal of 61634919 is 91943616.

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

It is a cyclic number.

It is not a de Polignac number, because 61634919 - 2¹³ = 61626727 is a prime.

It is a super-2 number, since 2×61634919² = 7597726480273122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61634929) 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, 193662 + ... + 193979.

It is an arithmetic number, because the mean of its divisors is an integer number (10466334).

Almost surely, 2^61634919 is an apocalyptic number.

61634919 is a deficient number, since it is larger than the sum of its proper divisors (22095753).

61634919 is a wasteful number, since it uses less digits than its factorization.

61634919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387697.

The product of its digits is 34992, while the sum is 39.

The square root of 61634919 is about 7850.7909792581. The cubic root of 61634919 is about 395.0107757569.

The spelling of 61634919 in words is "sixty-one million, six hundred thirty-four thousand, nine hundred nineteen".