30139961 has 8 divisors (see below), whose sum is σ = 31941000. Its totient is φ = 28389760.

The previous prime is 30139957. The next prime is 30139981. The reversal of 30139961 is 16993103.

It can be written as a sum of positive squares in 4 ways, for example, as 109561 + 30030400 = 331^2 + 5480^2 .

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 30139961 - 2² = 30139957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30139981) 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, 11486 + ... + 13863.

It is an arithmetic number, because the mean of its divisors is an integer number (3992625).

Almost surely, 2^30139961 is an apocalyptic number.

It is an amenable number.

30139961 is a deficient number, since it is larger than the sum of its proper divisors (1801039).

30139961 is a wasteful number, since it uses less digits than its factorization.

30139961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25419.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 30139961 is about 5489.9873406047. The cubic root of 30139961 is about 311.2057137143.

The spelling of 30139961 in words is "thirty million, one hundred thirty-nine thousand, nine hundred sixty-one".