154880861 has 2 divisors, whose sum is σ = 154880862. Its totient is φ = 154880860.

The previous prime is 154880777. The next prime is 154880917. The reversal of 154880861 is 168088451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118940836 + 35940025 = 10906^2 + 5995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154880861 is a prime.

It is a super-2 number, since 2×154880861² = 47976162208202642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154880161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77440430 + 77440431.

It is an arithmetic number, because the mean of its divisors is an integer number (77440431).

Almost surely, 2^154880861 is an apocalyptic number.

It is an amenable number.

154880861 is a deficient number, since it is larger than the sum of its proper divisors (1).

154880861 is an equidigital number, since it uses as much as digits as its factorization.

154880861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61440, while the sum is 41.

The square root of 154880861 is about 12445.1139408203. The cubic root of 154880861 is about 537.0308707070.

The spelling of 154880861 in words is "one hundred fifty-four million, eight hundred eighty thousand, eight hundred sixty-one".