154991957 has 2 divisors, whose sum is σ = 154991958. Its totient is φ = 154991956.

The previous prime is 154991953. The next prime is 154991989. The reversal of 154991957 is 759199451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85119076 + 69872881 = 9226^2 + 8359^2 .

It is a cyclic number.

It is not a de Polignac number, because 154991957 - 2² = 154991953 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154991951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77495978 + 77495979.

It is an arithmetic number, because the mean of its divisors is an integer number (77495979).

Almost surely, 2^154991957 is an apocalyptic number.

It is an amenable number.

154991957 is a deficient number, since it is larger than the sum of its proper divisors (1).

154991957 is an equidigital number, since it uses as much as digits as its factorization.

154991957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 510300, while the sum is 50.

The square root of 154991957 is about 12449.5765791452. The cubic root of 154991957 is about 537.1592440509.

The spelling of 154991957 in words is "one hundred fifty-four million, nine hundred ninety-one thousand, nine hundred fifty-seven".