61099381 has 4 divisors (see below), whose sum is σ = 69827872. Its totient is φ = 52370892.

The previous prime is 61099327. The next prime is 61099391. The reversal of 61099381 is 18399016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61099381 - 2⁷ = 61099253 is a prime.

It is a super-2 number, since 2×61099381² = 7466268717166322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61099381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61099391) 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, 4364235 + ... + 4364248.

It is an arithmetic number, because the mean of its divisors is an integer number (17456968).

Almost surely, 2^61099381 is an apocalyptic number.

It is an amenable number.

61099381 is a deficient number, since it is larger than the sum of its proper divisors (8728491).

61099381 is an equidigital number, since it uses as much as digits as its factorization.

61099381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8728490.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 61099381 is about 7816.6093032721. The cubic root of 61099381 is about 393.8633799301.

The spelling of 61099381 in words is "sixty-one million, ninety-nine thousand, three hundred eighty-one".