30157661 has 2 divisors, whose sum is σ = 30157662. Its totient is φ = 30157660.

The previous prime is 30157657. The next prime is 30157667. The reversal of 30157661 is 16675103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29365561 + 792100 = 5419^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 30157661 - 2² = 30157657 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30157667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15078830 + 15078831.

It is an arithmetic number, because the mean of its divisors is an integer number (15078831).

Almost surely, 2^30157661 is an apocalyptic number.

It is an amenable number.

30157661 is a deficient number, since it is larger than the sum of its proper divisors (1).

30157661 is an equidigital number, since it uses as much as digits as its factorization.

30157661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 30157661 is about 5491.5991295797. The cubic root of 30157661 is about 311.2666213712.

The spelling of 30157661 in words is "thirty million, one hundred fifty-seven thousand, six hundred sixty-one".