61378231 has 8 divisors (see below), whose sum is σ = 63354240. Its totient is φ = 59433528.

The previous prime is 61378223. The next prime is 61378241. The reversal of 61378231 is 13287316.

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 61378231 - 2³ = 61378223 is a prime.

It is a super-2 number, since 2×61378231² = 7534574481378722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61378193 and 61378202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61378201) 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, 3811 + ... + 11716.

It is an arithmetic number, because the mean of its divisors is an integer number (7919280).

Almost surely, 2^61378231 is an apocalyptic number.

61378231 is a deficient number, since it is larger than the sum of its proper divisors (1976009).

61378231 is a wasteful number, since it uses less digits than its factorization.

61378231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15653.

The product of its digits is 6048, while the sum is 31.

The square root of 61378231 is about 7834.4260159887. The cubic root of 61378231 is about 394.4616519167.

The spelling of 61378231 in words is "sixty-one million, three hundred seventy-eight thousand, two hundred thirty-one".